RSS Feed/News Microsoft connected account registration fails with missing provider_key

[ENXF NET]

When attempting to use the built-in Microsoft connected account provider, authentication with Microsoft completes successfully, but XenForo fails after redirecting back with:

Oops! We ran into some problems.
Please enter a value for the required field 'provider_key'.
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The ACP Test provider function similarly reports:

Test failed while connecting with Microsoft. Unable to retrieve provider key.
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I was able to reproduce on several prominent XenForo boards. Seems...

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