XenForo OAuth troubleshooting help needed MediaWiki

I'm new to XenForo; our whole forum is moving to XenForo from vBulletin in the next few weeks. We have run into a problem with OAuth talking to MediaWiki. So, after a lot of debugging and troubleshooting, I tried a different solution, using WordPress as an OAuth client and XenForo as the OAuth provider. I end up with the same problem. Data is not being sent back to MediaWiki or WordPress. I also tested via curl and Postman; all results were the same.

I'm trying to find a few things.
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