EWS callback failed

[andrewpmiller]

Plugin fails to display headers every time and displays an error dialog.

Outlook for iOS Version: 4.2403.0

[stephenegriffin]

If you click the gear icon there is a diagnostics button. Could you open the diagnostics panel and copy/paste what you see in there?

[andrewpmiller]

Diagnostics:

User Agent = Mozilla/5.0 (iPhone; CPU iPhone OS 17_2_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/15E148
Requirement set = 1.11
ui = new-mobile
Last Update = Wed, 31 May 2023 15:21:33 GMT
mhaVersion = 11728c4a3
contentLanguage = en-US
displayLanguage = en-US
hostname = OutlookIOS
hostVersion = 4.2404.0.0
permissionLevel = 3
canUseAPI = true
canUseRest = true
sufficientPermission = true
origin = https://mha.azurewebsites.net
path = /Pages/parentframe.html
API used = EWS
itemId = true
itemType = message
itemClass = IPM.Note
getAllInternetHeadersAsyncFailure = {"status":"failed","error":{"name":"Permission Denied","message":"You don't have sufficient permissions for this action.","code":7000}}
callbackTokenFailure = {"status":"failed","error":{"name":"AccessRestricted","message":"Internal protocol error: '-2147467259'.","code":9017},"diagnostics":{"InvokeCodeResult":-2147467259}}
ERROR: Unable to obtain callback token.
Fallback to Rest.
{
  "status": "failed",
  "error": {
    "name": "Permission Denied",
    "message": "You don't have sufficient permissions for this action.",
    "code": 7000
  }
} : You don't have sufficient permissions for this action.
Office.context.mailbox.item.getAllInternetHeadersAsync(function (webpack://mha/src/Scripts/GetHeadersAPI.ts:42:31)
a (https://appsforoffice.microsoft.com/lib/1/hosted/outlook-ios-16.00.js:20:199653)
d (https://appsforoffice.microsoft.com/lib/1/hosted/outlook-ios-16.00.js:20:114182)
b (https://appsforoffice.microsoft.com/lib/1/hosted/outlook-ios-16.00.js:20:109625)
::
::
ERROR: Unable to obtain callback token.
Fallback to EWS.
{
  "status": "failed",
  "error": {
    "name": "AccessRestricted",
    "message": "Internal protocol error: '-2147467259'.",
    "code": 9017
  },
  "diagnostics": {
    "InvokeCodeResult": -2147467259
  }
} : Internal protocol error: '-2147467259'.
Office.context.mailbox.getCallbackTokenAsync (webpack://mha/src/Scripts/GetHeadersRest.ts:164:31)
a (https://appsforoffice.microsoft.com/lib/1/hosted/outlook-ios-16.00.js:20:199653)
d (https://appsforoffice.microsoft.com/lib/1/hosted/outlook-ios-16.00.js:20:114182)
b (https://appsforoffice.microsoft.com/lib/1/hosted/outlook-ios-16.00.js:20:109625)
::
::
ERROR: Async Response
{
  "status": "succeeded"
}
asyncResult (webpack://mha/src/Scripts/GetHeadersEWS.ts:95:27)
mailbox.makeEwsRequestAsync (webpack://mha/src/Scripts/GetHeadersEWS.ts:145:46)
a (https://appsforoffice.microsoft.com/lib/1/hosted/outlook-ios-16.00.js:20:199653)
d (https://appsforoffice.microsoft.com/lib/1/hosted/outlook-ios-16.00.js:20:114182)
b (https://appsforoffice.microsoft.com/lib/1/hosted/outlook-ios-16.00.js:20:109625)
::
::
ERROR: EWS callback failed : Failed to retrieve headers.
mailbox.makeEwsRequestAsync (webpack://mha/src/Scripts/GetHeadersEWS.ts:145:46)
a (https://appsforoffice.microsoft.com/lib/1/hosted/outlook-ios-16.00.js:20:199653)
d (https://appsforoffice.microsoft.com/lib/1/hosted/outlook-ios-16.00.js:20:114182)
b (https://appsforoffice.microsoft.com/lib/1/hosted/outlook-ios-16.00.js:20:109625)
::
::

[PDWP]

Same issue with me. It's not been working for quite some time. Just now decided to try doing something about it. The extension is really one of my must haves, and I miss it. Here is my diagnostics log. Please advise.

User Agent = Mozilla/5.0 (iPhone; CPU iPhone OS 17_5_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/15E148
Requirement set = 1.11
ui = new-mobile
Last Update = Tue, 16 Apr 2024 13:49:50 GMT
mhaVersion = 206795b
contentLanguage = en-US
displayLanguage = en-US
hostname = OutlookIOS
hostVersion = 4.2423.0.0
permissionLevel = 3
canUseAPI = true
canUseRest = true
sufficientPermission = true
origin = https://mha.azurewebsites.net/
path = /Pages/parentframe.html
API used = EWS
itemId = true
itemType = message
itemClass = IPM.Note
getAllInternetHeadersAsyncFailure = {"status":"failed","error":{"name":"Permission Denied","message":"You don't have sufficient permissions for this action.","code":7000}}
callbackTokenFailure = {"status":"failed","error":{"name":"AccessRestricted","message":"Internal protocol error: '-2147467259'.","code":9017},"diagnostics":{"InvokeCodeResult":-2147467259}}
ERROR: Unable to obtain callback token.
Fallback to Rest.
{
"status": "failed",
"error": {
"name": "Permission Denied",
"message": "You don't have sufficient permissions for this action.",
"code": 7000
}
} : You don't have sufficient permissions for this action.
Office.context.mailbox.item.getAllInternetHeadersAsync(function (webpack://mha/src/Scripts/GetHeadersAPI.ts:42:31)
a (https://appsforoffice.microsoft.com/lib/1/hosted/outlook-ios-16.00.js:20:202989)
d (https://appsforoffice.microsoft.com/lib/1/hosted/outlook-ios-16.00.js:20:114717)
b (https://appsforoffice.microsoft.com/lib/1/hosted/outlook-ios-16.00.js:20:110160)
::
::
ERROR: Unable to obtain callback token.
Fallback to EWS.
{
"status": "failed",
"error": {
"name": "AccessRestricted",
"message": "Internal protocol error: '-2147467259'.",
"code": 9017
},
"diagnostics": {
"InvokeCodeResult": -2147467259
}
} : Internal protocol error: '-2147467259'.
Office.context.mailbox.getCallbackTokenAsync (webpack://mha/src/Scripts/GetHeadersRest.ts:164:31)
a (https://appsforoffice.microsoft.com/lib/1/hosted/outlook-ios-16.00.js:20:202989)
d (https://appsforoffice.microsoft.com/lib/1/hosted/outlook-ios-16.00.js:20:114717)
b (https://appsforoffice.microsoft.com/lib/1/hosted/outlook-ios-16.00.js:20:110160)
::
::
ERROR: Async Response
{
"status": "succeeded"
}
asyncResult (webpack://mha/src/Scripts/GetHeadersEWS.ts:95:27)
mailbox.makeEwsRequestAsync (webpack://mha/src/Scripts/GetHeadersEWS.ts:145:46)
a (https://appsforoffice.microsoft.com/lib/1/hosted/outlook-ios-16.00.js:20:202989)
d (https://appsforoffice.microsoft.com/lib/1/hosted/outlook-ios-16.00.js:20:114717)
b (https://appsforoffice.microsoft.com/lib/1/hosted/outlook-ios-16.00.js:20:110160)
::
::
ERROR: EWS callback failed : Failed to retrieve headers.
mailbox.makeEwsRequestAsync (webpack://mha/src/Scripts/GetHeadersEWS.ts:145:46)
a (https://appsforoffice.microsoft.com/lib/1/hosted/outlook-ios-16.00.js:20:202989)
d (https://appsforoffice.microsoft.com/lib/1/hosted/outlook-ios-16.00.js:20:114717)
b (https://appsforoffice.microsoft.com/lib/1/hosted/outlook-ios-16.00.js:20:110160)
::
::

[stephenegriffin]

For both of these - we're trying three different ways to fetch the data, getAllInternetHeadersAsync, rest call, and EWS call. All three are failing with a permissions issue. So the problem would appear to be on your end, but I'm not sure what to advise you should check. Perhaps uninstalling the application from your tenant and then re-adding it might be enough to grant permissions?

[konste]

I got exactly the same issue with exactly the same diagnostic output. 😢
Can this be relevant?
This must be relevant!

[ahrex]

+1 on seeing this issue on mobile (iOS).

Desktop works fine.

[o-l-a-v]

Same issue, Samsung S24+.

Diagnostics
User Agent = Mozilla/5.0 (Linux; Android 16; SM-S926B Build/BP2A.250605.031.A3; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/144.0.7559.59 Mobile Safari/537.36
Requirement set = 1.5
ui = new-mobile
Last Update = Wed, 14 Jan 2026 15:34:33 GMT
mhaVersion = 1e7192e0
contentLanguage = en-CA
displayLanguage = en-CA
hostname = OutlookAndroid
hostVersion = 5.2603.1.0
permissionLevel = 3
canUseAPI = false
canUseRest = true
sufficientPermission = true
origin = https://mha.azurewebsites.net
path = /Pages/uitoggle.html
API used = Not set
itemId = true
itemType = message
itemClass = IPM.Note
noAPIreason = requirements too low
callbackTokenFailure = {"status":"failed","error":{"name":"Internal Error","message":"Internal Error","code":5001}}
ERROR: API failed, trying REST
ERROR: No access token?
ERROR: REST failed, trying EWS
ERROR: Unable to obtain callback token.
Fallback to EWS.
{
  "status": "failed",
  "error": {
    "name": "Internal Error",
    "message": "Internal Error",
    "code": 5001
  }
} : Internal Error
_generateError (webpack://mha/node_modules/stacktrace-js/stacktrace.js:28:18)
get (webpack://mha/node_modules/stacktrace-js/stacktrace.js:77:22)
Errors.isError (webpack://mha/src/Scripts/stacks.ts:28:26)
handler (webpack://mha/src/Scripts/stacks.ts:45:13)
parse (webpack://mha/src/Scripts/Errors.ts:81:14)
a (https://appsforoffice.microsoft.com/lib/1/hosted/outlook-android-16.00.js:20:191473)
e (https://appsforoffice.microsoft.com/lib/1/hosted/outlook-android-16.00.js:20:114131)
ERROR: Async Response
{
  "status": "succeeded"
}
_generateError (webpack://mha/node_modules/stacktrace-js/stacktrace.js:28:18)
get (webpack://mha/node_modules/stacktrace-js/stacktrace.js:77:22)
Errors.isError (webpack://mha/src/Scripts/stacks.ts:28:26)
handler (webpack://mha/src/Scripts/stacks.ts:45:13)
parse (webpack://mha/src/Scripts/Errors.ts:81:14)
log (webpack://mha/src/Scripts/ui/getHeaders/GetHeadersEWS.ts:93:23)
a (https://appsforoffice.microsoft.com/lib/1/hosted/outlook-android-16.00.js:20:191473)
ERROR: EWS callback failed : Failed to retrieve headers.
o.callbackEws (webpack://mha/src/Scripts/ui/getHeaders/GetHeadersEWS.ts:88:22)
a (https://appsforoffice.microsoft.com/lib/1/hosted/outlook-android-16.00.js:20:191473)
e (https://appsforoffice.microsoft.com/lib/1/hosted/outlook-android-16.00.js:20:114131)
a.agaveHostCallback (https://appsforoffice.microsoft.com/lib/1/hosted/outlook-android-16.00.js:20:111943)
Object.g [as agaveHostCallback] (https://appsforoffice.microsoft.com/lib/1/hosted/outlook-android-16.00.js:20:110814)
a.ReceiveMessage (https://appsforoffice.microsoft.com/lib/1/hosted/outlook-android-16.00.js:20:117341)
agaveHostCallback (https://appsforoffice.microsoft.com/lib/1/hosted/outlook-android-16.00.js:20:117718)