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I have a MessageCard I send to Teams via Incoming Webhook. It contains a HttpPOST action which includes an Authorization header. After much research, I have discovered Teams overwrites this with its own JWT value making it impossible for the resulting HTTP POST to authenticate with the endpoint I am targeting. I do not control the endpoint and the endpoint only supports passing a token via HTTP Authorization header.
Is there any workaround?
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Hi @Mike Gorman
Teams tag is mainly focused on the general issue of Microsoft Teams troubleshooting. According to your description, your question is related to Teams Development, which is not in our support scope. To better help you solve the problem, please add Teams Development tag to your post.
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Hi Mike Gorman - Thanks for raising the query.
We will look into it and let you know the updates.
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Hello Mike Gorman,
This is by design. Please find the related documentation here for sender validation & verification: Security requirements for actionable messages - Outlook Developer | Microsoft Learn
Also, please note that the Connectors feature is on a deprecation timeline: Retirement of Office 365 connectors within Microsoft Teams and users are encouraged to move to Power Automate/Workflows for these use cases.