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> sudo su - svc-mongo
> Last login: Fri Jan 28 16:04:57 CST 2022 on pts/0
> mesg: cannot open /dev/pts/1: Permission denied

I guess there is "mesg y" (or "mesg n") in the user's profile file. 

The bugfix in rhel-8.5 has fixed "mesg" (without any option). If you call "mesg y|n" then it needs to open and modify the terminal setting, but the terminal is still owned by the root user. This is impossible to fix.

Example:

 # su - kzak
 Last login: Tue Feb 15 03:50:00 EST 2022 on pts/0

 $ mesg
 is y

 $ mesg y
 mesg: cannot open /dev/pts/0: Permission denied

 $ rpm -qf /bin/mesg
 util-linux-2.32.1-32.el8.x86_64


This is expected behavior.


Note that since util-linux v2.7 (RHEL-9) it will be possible to use "su --pty" to create a new terminal owned by the user.

Sorry for typo -- s/since util-linux v2.7/since util-linux v2.37/

*** Bug 2036583 has been marked as a duplicate of this bug. ***