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Your Environment

Platform [PC desktop, Mac, iOS, Office on the web]: PC Desktop
Host [Excel, Word, PowerPoint, etc.]: Outlook Desktop (old one)
Office version number: Many, from 16.0.17531.20152 to 16.0.18227.20046
Operating System: Windows
Browser (if using Office on the web): -

Expected behavior

Event-based add-ins are to work as expected, or a suggestive error will be thrown if errors are being made in code.

Current behavior

Event-based actions such as OnNewMessageCompose or OnMessageRecipientsChanged, in Outlook Desktop (the old one), sometimes fail with Unable to get property 'l_ElevatedPermissionNeededForMethod_Text' of undefined or null reference. This issue is seen in our error logs for 3497 times in the past 7 days, 70 different customers. It is not always happening and cannot be reproduced by us or by the customers at request.

Steps to reproduce

Cannot reproduce.

Provide additional details

The only other report around this is here https://github.com/OfficeDev/office-js/issues/2204 and it concluded with the usage of promises being the problem. We are indeed using promises, but at the same time the code is transpiled to ES16 and it works correctly in the majority of cases. There is even documentation about how to do it and I don't remember seeing anything about not using them anywhere. If this would be the case, we would need an official confirmation as it would basically require us to rewrite the entire project.

Example of usage:

export function getRecipients() {
  return new Promise<Office.EmailAddressDetails[]>((resolve, reject) => {
    const { mailbox } = Office.context;

    if (!mailbox.item) {
      reject(new Error('Unable to get recipients: No mailbox item'));
      return;
    }

    mailbox.item.to.getAsync({}, asyncResultCallback(resolve, reject));
  });
}

export function asyncResultCallback<ReturnType>(
  resolve: (value: ReturnType) => void,
  reject: (reason?: unknown) => void,
): (asyncResult: Office.AsyncResult<ReturnType>) => void {
  const { AsyncResultStatus } = Office;

  return ({ error, status, value, diagnostics }) => {
    if (status !== AsyncResultStatus.Succeeded) {
      reject({
        ...error,
        errorOrigin: 'OfficeJS',
        diagnostics: diagnostics as unknown,
      });
      return;
    }

    resolve(value);
  };
}

Not sure if related, but we are assigning a random GUID to all items and storing it as a custom property. Then, that id is passed in the error object. (We're doing this as in Outlook Dekstop the message ID is not available before the item is saved and we needed a method to correlate the different errors). For most of these exceptions, there is no ID. Could this be caused by a CustomPropertiesService issue? Obviously, we're first checking for an existing one.
We have some reports from a customer experiencing this exception that the Web Add-in works for a few hours until at some point it crashes and then disappears from the Ribbon. Also, the events are not triggered anymore (as expected). Restarting Outlook solves the issue until it occurs again. Could this be related or help identity the cause?

Useful logs

Examples of exceptions:

{"message":"Unable to get property 'l_ElevatedPermissionNeededForMethod_Text' of undefined or null reference","description":"Unable to get property 'l_ElevatedPermissionNeededForMethod_Text' of undefined or null reference","number":-2146823281,"stack":"TypeError: Unable to get property 'l_ElevatedPermissionNeededForMethod_Text' of undefined or null reference\n   at H (Unknown script code:26:16539)\n   at B (Unknown script code:26:16710)\n   at Anonymous function (Unknown script code:26:48768)\n   at Anonymous function (Unknown script code:1:45225)\n   at B (Unknown script code:10:38607)\n   at D (Unknown script code:1:45091)\n   at Jt (Unknown script code:1:51487)\n   at Anonymous function (Unknown script code:7:16682)\n   at Generator.prototype.next (native code)\n   at ot (Unknown script code:7:15145)"}

Redacted the user name

{"stack":"TypeError: Cannot read properties of undefined (reading 'l_ElevatedPermissionNeededForMethod_Text')\n    at H (C:\\Program Files\\Microsoft Office\\root\\Office16\\olk-launchevent-host.win32.bundle:26:16547)\n    at B (C:\\Program Files\\Microsoft Office\\root\\Office16\\olk-launchevent-host.win32.bundle:26:16718)\n    at Object.<anonymous> (C:\\Program Files\\Microsoft Office\\root\\Office16\\olk-launchevent-host.win32.bundle:26:48768)\n    at C:\\Users\\***\\AppData\\Local\\Microsoft\\Office\\16.0\\Wef\\{98C45364-3071-46B3-BD6B-422B61272356}\\Jte1SMcezEX_QO77B5Wo1g==\\Javascript\\5801732f-85b5-4ecb-9bd5-8e928c9088ca_1.0.0.14_en-US\\bundle.js:1:45254\n    at new Promise (<anonymous>)\n    at D (C:\\Users\\***\\AppData\\Local\\Microsoft\\Office\\16.0\\Wef\\{98C45364-3071-46B3-BD6B-422B61272356}\\Jte1SMcezEX_QO77B5Wo1g==\\Javascript\\5801732f-85b5-4ecb-9bd5-8e928c9088ca_1.0.0.14_en-US\\bundle.js:1:45091)\n    at Jt (C:\\Users\\***\\AppData\\Local\\Microsoft\\Office\\16.0\\Wef\\{98C45364-3071-46B3-BD6B-422B61272356}\\Jte1SMcezEX_QO77B5Wo1g==\\Javascript\\5801732f-85b5-4ecb-9bd5-8e928c9088ca_1.0.0.14_en-US\\bundle.js:1:51494)\n    at C:\\Users\\***\\AppData\\Local\\Microsoft\\Office\\16.0\\Wef\\{98C45364-3071-46B3-BD6B-422B61272356}\\Jte1SMcezEX_QO77B5Wo1g==\\Javascript\\5801732f-85b5-4ecb-9bd5-8e928c9088ca_1.0.0.14_en-US\\bundle.js:7:16694\n    at Generator.next (<anonymous>)\n    at ot (C:\\Users\\***\\AppData\\Local\\Microsoft\\Office\\16.0\\Wef\\{98C45364-3071-46B3-BD6B-422B61272356}\\Jte1SMcezEX_QO77B5Wo1g==\\Javascript\\5801732f-85b5-4ecb-9bd5-8e928c9088ca_1.0.0.14_en-US\\bundle.js:7:15149)","message":"Cannot read properties of undefined (reading 'l_ElevatedPermissionNeededForMethod_Text')"}

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OfficeDev / office-js

ElevatedPermissionNeededForMethod error sometimes breaks event based logic in Outlook Desktop (old) #5124