@HuzMS Thank you for reaching out to Microsoft Q&A. Apologize for the inconvenience caused on this. Could you help us in sharing more information about what the error message is or with the screenshot when you are trying to access the domain manager.
Transferring of domain out of Azure (not a registrar) to another registrar is supported and you may currently do so via API and PowerShell. You will need to get an authorization code which you can take to the registrar of choice to proceed with transferring out of your domain.
You can refer to [this documentation] (https://azure.github.io/AppService/2021/09/22/2021-Managing-ASD.html#transfering-domain-out) to transfer your domain out of Azure or you can refer to this community discussion as well on How to transfer your domain out of Azure.