Hello @Carlos_Castellano_Herrera ,
Welcome to The MongoDB Community Forums! 
I saw that you have not had a response to this topic yet, were you able to find a solution?
An authentication error typically indicates an incorrect password. If your password contains special characters, try wrapping them in quotes, or using URL encoding for special characters.
You may also want to verify that you are using your MongoDB user password. Note that this may be different to the password you use for your Atlas login. You can see your MongoDB Users by clicking the Security tab on your MongoDB Atlas cluster.
Regards,
Tarun