Hi @vrithner
To re-link your existing domain by creating the Azure Custom Domain resource without initiating a new purchase, ensure that the domain is still associated with your Azure subscription. Since you deleted the Custom Domain resource, you can recreate it under the same subscription if the domain was deleted fewer than seven days ago. If it has been more than seven days, contact Azure support for assistance in restoring the domain.
Regarding the x-ms-correlation-request-id error, this could be related to the recent deletion of the Custom Domain resource. Check for any lingering configurations or dependencies that could be causing the failure. Ensure that the domain correctly points to the app's IP address and that your DNS settings are properly configured.
For domain registration renewal, since it remains active at secureserver.net, follow the renewal process as instructed by your domain registrar.
Troubleshoot domain and TLS/SSL certificate problems in Azure App Service
Resolve errors for storage account names
https://learn.microsoft.com/en-us/azure/app-service/manage-custom-dns-buy-domain#renew-the-domain
Let me know if you any further assistances.