Hi @Hakan Ozen ,
Thank you for the feedback. Currently the process is to add a custom domain in Azure and verify it with TXT or MX. https://learn.microsoft.com/en-us/azure/active-directory/fundamentals/add-custom-domain
For further product requests, I would recommend reaching out in User Voice where the product team can respond directly. https://feedback.azure.com/
If you share a feature request and post it back here I will upvote it and help spread the word.