Error starting GCP free trial despite 'Owner' role

I added the Project Billing Manager role for myself and still have the same issue. It doesn’t seem to be a role issue.

What is the exact error?

Did you use the same account earlier for free trial?

https://cloud.google.com/free/docs/free-cloud-features#free-trial

The error is in the main message screenshot and no I’ve used that account before

You have used that account before? It doesn’t qualify for more than once.

Sorry, I meant, I have not used that account before