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Unable to login at server. Probably wrong configuration, username, or password on only one of my PCs

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I have 4 PCs, all are Windows 10 Pro, version 21H1. All have installed Thunderbird 91.2.0 x64. On all, I am using the Sophos Endpoint Security virus protection.

All PCs but one are working OK with Thunderbird. Recently I changed the password of one of my gmail.com accounts. On three PCs I could update the password settings in Thunderbird without issues. On the fourth, it just didn't accept the new password. So I deleted the account on that PC and tried to recreate it. It worked to the point where I clicked the 'Done' button in the Account Setup dialog and logged into my Google account and clicked 'Allow' to enable Thunderbird to access the Google mail account. At that moment 'Checking password' message changed to 'Unable to login at server' on a yellow background in the Account Setup dialog. On that same PC, I can access Gmail through the web interface without trouble.

When trying to solve the issue I uninstalled the Thunderbird, removed its folders in Local and Roaming folders, then reset the PC and installed the Thunderbird again. The issue was not solved. I can't configure any of the Google accounts, but I have no trouble with the two non-Google IMAP accounts that I have.

Just to make sure, I tried to delete and then recreate a Google account on one of the PCs which seem to work OK and that worked without a glitch.

I also tested the 'problem' PC and was not able to detect any issues except the one with the Thunderbird.

I have 4 PCs, all are Windows 10 Pro, version 21H1. All have installed Thunderbird 91.2.0 x64. On all, I am using the Sophos Endpoint Security virus protection. All PCs but one are working OK with Thunderbird. Recently I changed the password of one of my gmail.com accounts. On three PCs I could update the password settings in Thunderbird without issues. On the fourth, it just didn't accept the new password. So I deleted the account on that PC and tried to recreate it. It worked to the point where I clicked the 'Done' button in the Account Setup dialog and logged into my Google account and clicked 'Allow' to enable Thunderbird to access the Google mail account. At that moment 'Checking password' message changed to 'Unable to login at server' on a yellow background in the Account Setup dialog. On that same PC, I can access Gmail through the web interface without trouble. When trying to solve the issue I uninstalled the Thunderbird, removed its folders in Local and Roaming folders, then reset the PC and installed the Thunderbird again. The issue was not solved. I can't configure any of the Google accounts, but I have no trouble with the two non-Google IMAP accounts that I have. Just to make sure, I tried to delete and then recreate a Google account on one of the PCs which seem to work OK and that worked without a glitch. I also tested the 'problem' PC and was not able to detect any issues except the one with the Thunderbird.