mapping custom domain to a AppEngine - ERROR:domain is already mapped to a project

[thstart]

I was mapping custom domain to a AppEngine test project. 

Then decided to delete this App and create new account.

Created AppEngine project again and tried to add the same domain.

Got an error message:

<MyDomain name> is already mapped to a project.

I deleted the A, AAAA and CNAME records in Google Domain but still get this message.

[Katayoon (Cloud Platform Support)]

Referring to this discussion, you are now able to manually override domain mappings by using the Admin API 'DomainOverrideStrategy' option:

- Simply create your domain mapping via the API Explorer by filling out the 'appsId' parameter and setting the 'overrideStrategy' parameter to "OVERRIDE" (without the quotes).

- Then add and fill out the 'DomainMapping' parameters in the 'Request body'. Also ensure you turn on 'Authorize requests using OAuth 2.0' so that you may prove your ownership over the project ID 'appsId' found in the Cloud Console.

[thstart]

I was able to do Override, thank you.