google cloud platform – App Engine Adding custom domain verification failed despite main site ownership verified

I am trying to veryfy a subdomain to configure a server side GTM container.

Google cloud site verification

The property is verified on the search console

search consoile site verification

However when I click refresh domain, I still get “Your domain hasn’t been verified yet. Finish all the steps in Search Console and then return to this page.”

If I remove the property and start again, it is automatically verified as the main domain is also verified.

But there are no changes in the custom domain section. i cannot configure it to accept my A and AAAA records

What can I do here?

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