2000237
The following diagnostic is generating:
e-file: Electronically filed returns cannot contain a pound sign '#', ampersand '&', apostrophe, underscore '_', or at sign '@' character in the client number. Please remove these symbols from the client number. ref. #2000237
Solution:
critical e-file diagnostic from clients tab highlight the client then Ctrl+N or choose Renumber from the Client dropdown and choose a new client number with only letters, numbers, and/or dashes (-)