My two source feeds which have been working fine for months are both showing up as “Invalid RSS” on the sources page as of a couple days ago. Both show as valid on 3 validator/test sites, both working fine in various RSS readers. I’ve tried deleting and re-adding them but I’m still getting errors.
I checked your feed and Micro.blog is getting a web page with “Please wait while your request is being verified” instead of the actual feed. We’ve seen this before with security software (or Cloudflare?) that is intercepting the request from Micro.blog thinking something is suspicious about it.
The only way around it that I’m aware of is for you to disable this at your hosting provider.