Mongodb initialization

[StavrosOrf]

Hello,
I am not very experienced with MongoDB Initialization and I just followed the instructions as stated in "MongoDB configuration" section. Specifically I cannot authenticate using :

MongoDB shell version v4.4.4
connecting to: mongodb://127.0.0.1:27017/?compressors=disabled&gssapiServiceName=mongodb
Implicit session: session { "id" : UUID("eefd4f48-5b68-4a77-b8f7-1b2bf909058b") }
MongoDB server version: 4.4.4

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db.auth('ADMIN_USER', 'ADMIN_PASSWORD')
Error: Authentication failed.
0

Which I think causes the following error when running the scheduler

Caused by: com.mongodb.MongoCommandException: Command failed with error 18 (AuthenticationFailed): 'Authentication failed.' on server 127.0.0.1:27017. The full response is {"ok": 0.0, "errmsg": "Authentication failed.", "code": 18, "codeName": "AuthenticationFailed"}

Probably I am doing something wrong, but I would appreciate any help.