ubuntu - whoami returns user but usermod complains it doesn't exist

Question

I have a linux(ubuntu) user "myuser"

whoami is able to return the username

myuser@host:/home/myuser$ whoami
myuser

id returns info related to the user too

myuser@host:~$ id
uid=43350(myuser) gid=600(staff) groups=600(staff),27(sudo)

Now I am trying to run docker commands without sudo. So I tried adding the user to the group, but usermod says user does not exist

myuser@host:/home/myuser$ sudo usermod -aG docker $USER
usermod: user 'myuser' does not exist

How do I fix this?

Edit: This is on a VM provided by corporate IT in my organization

标签： ubuntu