^Hi @Stage4000, that error is unrelated to the 521 error your origin is passing to Cloudflare. If you’re still seeing that API error (I am not seeing that in your account at the moment), please let Support know. The team found & fixed that a few weeks ago and if you’re seeing it now, they’ll want to know about it.
Beyond that, if you see the 521 again, you could walk through the first half-dozen quick fix ideas in this tip just to cross them off the troubleshooting list: Community Tip - Fixing Error 521: Web server is down.
I don’t see a 521, perhaps clear cache if you’re still seeing it or try from a different/mobile browser.
