Cannot open Trados Studio 2022 subscription suddenly

Error message "Error opening Studio. Message: The input is not a valid Base-64 string as it contains a non base-64 character, more than two padding characters, or an illegal character among the padding characters." This is not a new account and I haven't installed any updates or plug-ins since yesterday when it was working fine. I'm not seeing anything helpful in the existing posts about this error message. 

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