How to resolve “possible System.NullReferenceException” while acquiring token

Hi,

I am following the sample code provided in "Azure-Sample" to acquire token to call Microsoft Graph Api. But Resharper suggesting "Possible System.NullReferenceException" in await app.AcquireTokenForClient(scopes) .ExecuteAsync(); How to resolve NullReference exception?

Thanks in advance for your help.

Regards,

Deb