When I had adhesion issues in the past, it was always one of the following:
- bed not clean
- wrong print profile
- wrong build plate selected
Make sure that you have selected the right build plate and filament in the flow calibration section, especially because by default bambu studio will select the first plate in the list (which would be the cool plate).
I had the issue with soap not helping anymore as well, which resulted in this thread: How long are the PEI sheets supposed to work? - #27 by user_3026326371
Maybe it helps?