Suddenly Bambu Studio tells me that my login has expired!!!?
When I try to login, an empty login screen appears, and I cannot get further.
What to do? Reinstall?
I am using: Bambu_Studio_win-v02.00.03.54 and Win11
Kind regards
I solved the with help from Copilot 
I changed/selected the language to english. The field was empty!!!
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I had the same problem, but English was already the chosen language. I changed it to Deutsch so I could change it to English again. It seemed to be stuck on Deutsch for a long time and would not allow me to immediately change back to English, so I became frightened, as I know very little Deutsch. But it eventually became unstuck and allowed me to change back to English. Changing the language did eliminate the error.
changing the language did not solve the issue for me. I can log into handy on my phone, makerworld on the web and the forums, but not bambu studio