convert_temporary_to_registered API fails completely

Symptoms

Once created, a temporary domain cannot be converted to registered using the API.

Cause

Once you have a temporary domain created, and you want to convert it to a registered domain, the API returns an error that the temporary domain is not one of your Addon domains.

# uapi --user=tempuser2 Domain convert_temporary_to_registered domain=curious-ruby-porpoise.10-2-66-60.cpanel.site registered=curious-ruby-porpoise.tld
---
apiversion: 3
func: convert_temporary_to_registered
module: Domain
result:
  data: ~
  errors:
    - The domain “curious-ruby-porpoise.10-2-66-60.cpanel.site” is not one of your addon domains.
  messages: ~
  metadata: {}

  status: 0
  warnings: ~

We've opened an internal case for our development team to investigate this further. For reference, the case number is CPANEL-48837. Follow this article to receive an email notification when a solution is published in the product. 

Resolution

You can still use the Modify An Account UI within WHM to convert the domain.