Why is the root user's password incorrect after setting the password?

Question

linux

Hello. The hoster does not allow creating a root user when registering a VPS

ok, I created another user, logged in with root rights
, set a password for the root user with the
passwd root
command After setting the password, a password error is written during authorization. What could be the matter?
At the same time, if I first log in as a user other than root, but with root rights, and execute su - root and enter the password, then I will be under the root user

Answer 1

Did you read the warning? Pay special attention to the last sentence.