crontab cannot start tmux session (Ubuntu) [closed]

I can start any tmux session myself, and they work. I can see them in ps -ef or whatever ps command.

tmux new-session -d -s my_tmuxsess 'python3 my_pyscript.py'

However, if I want to start it with crontab, it doesnt work. Nothing in ps output.

38 10 * * * tmux new-session -d -s my_tmuxsess 'python3 my_pyscript.py'

Update:I just tried with below. No success

38 10 * * * . $HOME/.profile; tmux new-session -d -s my_tmuxsess 'python3 my_pyscript.py'

kill works in crontab, e.g.:

38 10 * * * kill -9 56

/var/log/cron.log only has

(root) RELOAD (crontabs/root)

(root) CMD (tmux new-session -d -s my_tmuxsess 'python3 my_pyscript.py')

Update2: Not sure if the issue is with the ubuntu container I made in docker desktop. root is the only user and both home and root directories are empty. So .profile does not exist