jellyfin unable to access files on external and internal storage

[mhkb]

Code:

sudo setfacl -b -R media/mhkb/dd085415-2b35-43eb-99cc-961c547c1c6f
sudo chown -R mkhb:jellyfin media/mhkb/dd085415-2b35-43eb-99cc-961c547c1c6f
sudo chmod -R 770 media/mhkb/dd085415-2b35-43eb-99cc-961c547c1c6f

getting this error now

mhkb@Pi5:~ $ sudo setfacl -b -R /media/mhkb/dd085415-2b35-43eb-99cc-961c547c1c6f
mhkb@Pi5:~ $ sudo chown -R mkhb:jellyfin /media/mhkb/dd085415-2b35-43eb-99cc-961c547c1c6f
chown: invalid user: ‘mkhb:jellyfin’