Test application showing the Office 365 OAuth2 SMTP.Send permission is broken

Usage:

• Run the app with dotnet run
• Login with Outlook.com / Hotmail consumer account
• Observe that the authentication to SMTP server fails

Expected result: Message box with "Success"

Actual result: SMTP authentication error (eg. "535: 5.7.3. Authentication unsuccessful")

Corporate account pass the test successfully.