Sunlit and iOS app working with Wordpress?

Sunlit and iOS app used to work with my Wordpress site, but I just tried posting today and I got this error on Sunlit:

<p>There has been a critical error on this website.</p><p><a href="">Learn more about troubleshooting WordPress.</a></p> (error: 500)

The error included all the HTML tags.

I thought it was because my images were too big, but even after resizing I was still getting the same error message.

Then I tried posting just a text message using the Micro.Blog iOS app and I get the following error:

An error occured. Please try again.

Just to double check, I went to to check my website and everything posted just fine through that. So I’m not sure what I’ve done wrong.

Is this related to the Debugging micropub setup issue?