Azure to Ionos .org domain name transfer

I want to transfer a custom domain I currently have on Azure, to Ionos. But after doing all the steps with the authentication code, I get an error some minutes later by email telling me this:

Dear xxxxx, 

The request to transfer the following domain name(s) to another registrar has been denied. The domain(s) currently has Private Registration: 

<website_name.com>

If you still want to transfer the domain(s) to another registrar, you must first cancel your Private Registration(s). 

Regards, 
Azure 

There’s nowhere I can find how to deactivate this Private Registration. How can I properly fully transfer my Azure custom domain to Ionos ? I can’t find any good documentation about this.

On Azure, I’m on a basic support plan so I can’t get any assistance upon my need.