Verifying Custom Domain in Entra ID fails. What now?

Hi folks,

Sorry if using the wrong tag. But impossible to find "Entra ID" here.

I have the same problem as described here in this thread:
https://learn.microsoft.com/en-us/answers/questions/1846473/why-wont-the-custom-domain-name-verify

Trying to verify a domain since days. nslookup is correct, the TXT record is correct yet it still can't be verified. I am using Namecheap as registrar where I configure the dns settings. Again, settings are correct.

Can anyone help ?

Cheers,
Gab