Impossible to enter letters in Bitlocker PIN (Not Recovery Key)

[Microsoft Windows]

In my company we have activated the alphanumeric Bitlocker PIN. A user has stopped being able to enter letters in his Bitlocker PIN and I have not found any solution on the internet or in the documentation. With USB keyboards it does not allow to enter letters either.I don't know what has changed, but we have had to skip the PIN with the Recovery Key to change to a PIN that only contains numbers. Why did this happen? You are the only person this has happened to. The notebook is an HP EliteBook 850 G8 Thanks in advance.Alejandro.

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