ChatGPT App submission, domain verification fails

Hi, I’m stuck on the domain verification when submitting a ChatGPT app as a business.
The .well-known/openai-apps-challenge is in the correct path, with the correct value, content-type and status code, but when I click verify it says “Domain verification failed: Challenge endpoint did not return 200 OK.”

Checking the WAF logs I see only one requests with user agent OpenAI-Domain-Verification the first time I created the app last week and I don’t receive any requests after clicking “verify domain”.
Purged every cache didn’t work.

I don’t know what else to try, any ideas or alternatives ways to verify my domain?