Issues with Whatsapp Integration

I’m having an issue connecting my WhatsApp Business number to my main property. Previously, I used this number with a test property, but I have since deleted the test property.

Now, when I try to add the number to my main property, I receive an error message stating that the number is already registered with another property.

Could you please assist me in unregistering this number from the deleted test property so that I can use it with my main property?

Thank you very much for your help.