This error is documented here. There are apparently no records in the database.ADMIN_COLLECTION matching {"phone": phone, "password": password}.
I recommend logging out your database.ADMIN_COLLECTION, phone and password values and then querying your MongoDB database yourself to see if you can find matching values.
I don’t know if you’re doing this or not, but I want to advise against storing passwords in plain text in a database. I hope that your password parameter is encrypted and/or hashed and salted, etc…