Can't connect Twitter account: Please enter a value for the required field 'provider_key'.

[pegasus]

I've set up a new Twitter app via the instructions in the XenForo manual. The integration fails "Test provider". Since there is a years-long thread about that issue on here, I figured it might work by going to my XenForo user's Connected accounts page and trying it out.

The button takes me to Twitter, which goes through the motions and redirects me back. XenForo asks me for my password. When I click to "Associate", XenForo gives the following message: "Please enter a value for the required...

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