From their site:
5 - Cannot type certain symbols in VM (examples: 1, 2, T, Y, etc.)From the menu bar click Parallels Desktop icon (II) > Preferences > Shortcuts, then select the VM in question and click the plus button to create the corresponding shortcut for the necessary symbol. Repeat for each symbol that cannot be typed.
Haven't test yet, had to change my windows password. I can't post a line here but go to their site and search Big Sur issues.
ThePrimate
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From Parallels site:
5 - Cannot type certain symbols in VM (examples: 1, 2, T, Y, etc.)From the menu bar click Parallels Desktop icon (II) > Preferences > Shortcuts, then select the VM in question and click the plus button to create the corresponding shortcut for the necessary symbol. Repeat for each symbol that cannot be typed.
Haven't test yet, had to change my windows password.