I just built a new PC running Windows 11 for my Dad. When I set up his Xfinity email on Thunderbird, it opens up a browser window and asks him to log into Xfinity. After typing in the email address and clicking 'Let's go', it refreshes the page and asks for the email address again. Sometimes, it advances and then asks for the password. The same thing happens where it just refreshes the page and asks for my password again, regardless of whether I type in the correct or incorrect password. I have cleared the cache and cookies, restarted the computer, and reinstalled Thunderbird countless times. Is there any way around this? He ran an older version of Thunderbird on his old PC with no issue.