I am running AIX and ksh. At the AIX prompt, I have:
AIX $
which matches the value for PS1
PS1='AIX $ '
when I issue the SH command from Universe, I get to the host system. I can issue AIX commands (without issue I think)
However, the Prompt is NOT displayed. It is just blank

The shells are linked together:
$ ls -al | grep 326868
# -r-xr-xr-x 5 bin bin 326868 Sep 12 2023 ksh
# -r-xr-xr-x 5 bin bin 326868 Sep 12 2023 psh
# -r-xr-xr-x 5 bin bin 326868 Sep 12 2023 rksh
# -r-xr-xr-x 5 bin bin 326868 Sep 12 2023 sh
# -r-xr-xr-x 5 bin bin 326868 Sep 12 2023 tsh
Does some configuration option need to be set ?