Not able to login to Poolmath on PC

Thank you for the welcome and for the assistance with the PC app. I just confirmed that the credentials I'm using with the PC app are that same that I successfully use with the iOS app. Something just came to mind that might be a factor: this PC is Windows 11. Does anyone know if that is a problem?
 
Should not be. My Win app works on my Win11 laptop.

The PC app has not been focused on as few use it.