Outlook, getAllInternetHeadersAsync returns empty string for a mail in sent folder

[michael-koch787]

Provide required information needed to triage your issue

When querying internet headers on a sent mail in sent mail folder via getAllInternetHeadersAsync() we just get back an empty string with a status of succeeded.
It works fine for received mails.

Your Environment

• Platform [PC desktop, Mac, iOS, Office on the web]: Web, New Outlook on PC
• Host [Excel, Word, PowerPoint, etc.]: Outlook
• Office version number: ______
• Operating System: Windows
• Browser (if using Office on the web): Chrome

Expected behavior

getAllInternetHeadersAsync() should return headers just like for received mails.

Current behavior

When querying internet headers on a sent mail in sent mail folder via getAllInternetHeadersAsync() we just get back an empty string with a status of succeeded.

Steps to reproduce

1. Send a mail
2. Navigate to sent mails folder
3. query headers via getAllInternetHeadersAsync()