The username only used uppercase and lowercase letters plus numbers, but the prompt indicated it did not comply with the regulations.

The username only used uppercase and lowercase letters plus numbers, but the prompt indicated it did not comply with the regulations.

Thank you for your feedback. This was caused by a translation error. The prompt in English is correct. However, the prompt in Chinese is incorrect.
So, the username only allows lowercase letters, not uppercase letters, right? The error occurred because of a translation mistake.
Yes. Not uppercase letters.