Modern Team Site Creation - Error - Suddenly the response for Site URL is Null

Modern site creation is suddenly failing today due to response coming back with Null.

Details:

 We have been using SharePoint’s REST API call to create a modern team site and the solution has been running for almost a year now without any problem. The API used: /_api/GroupSiteManager/CreateGroupEx (HTTP/1.1)

Reference: https://github.com/SharePoint/PnP/tree/master/Samples/Provisioning.Modern.Console.RESTAPI

This solution was discussed with Microsoft an year ago recommended by MS as a supported solution.

Issue/Root cause:

This morning we have noticed that the API call returns following response with Null for site url:

{"@odata.context":"*****/_api/$metadata#Microsoft.SharePoint.Portal.GroupSiteInfo","DocumentsUrl":null,"ErrorMessage":null,"GroupId":"10033797-4f17-489f-9446-4d65b756585f","SiteStatus":1,"SiteUrl":null}

Ultimately the site will get created but it takes fair amount of time and our process will error out due to null response.

Any directions is really helpful.

Regards,

Vishwa