I have a problem with the wall adhesion on my A1 with elegoo tpu. I use the standard generic tpu profile on Orcaslicer. before it printed perfect. no stringing. almost no visible seams.
Currently I am printing book sleeves. so it is just an rectangular box with one side open.
If the inner and outer walls aren’t glued together it might mean that it is and infill issue, It might be that the infill pattern coincides to not be in the infill areas or that it is set to a low value, if the walls are thin enough I would make the infill 100%.