Error fetching base onedrive url

[PinnacleCoders]

Hello,
I keep getiing an empty base url for onedrive.

// In GetOneDriveClientAsync(OneDriveUser user)
// Resolve the API URL for this user always returns null
                user.OneDriveBaseUrl = await LookupOneDriveUrl(user);

because of which I get an exception "Unable to parse base Url"

public OneDriveAccountServiceProvider(OneDriveUser user)
        {
           
// Always throws error
            if (!Uri.TryCreate(user.OneDriveBaseUrl, UriKind.Absolute, out baseUrl))
            {
                throw new InvalidOperationException("Unable to parse base URL: " + user.OneDriveBaseUrl);
            }

Has anybody faced this issue? Any help will be much appreciated.