When I type “db.changeUserPassword(‘MyUserName’, ‘MyPassword’)” this appear: MongoServerError[AtlasError]: CMD_NOT_ALLOWED: updateUser And I am the administrator, since I am taking a class for my college.

I resolved this issue by going to Database Access in the left menu in the Clusters view, clicking Edit on my user, and then clicking Edit Password.

I can't change my password

Ramachandra_Tummala (Ramachandra Tummala) April 23, 2025, 3:38pm 2

I am assuming yours is a M0 cluster
If yes it is an unsupported command
Check this link