Registration Disabled Error on Login Attempt

[alpeer]

Problem: It returns E409 on Login, not sure if it's a bug

I disabled registration by setting max_users: -1 and added user manually to htpasswd (I tested login before disabling registration and login/publishing was working properly)
After disabling registration I tried login by npm login --registry=https://MY_VERDACCIO_ADDRESS_MASKED and entered credentials.
It responded like this:

npm notice Log in on https://MY_VERDACCIO_ADDRESS_MASKED
Username: admin
Password: 

npm error code E409
npm error 409 Conflict - PUT https://MY_VERDACCIO_ADDRESS_MASKED/-/user/org.couchdb.user:admin/-rev/undefined - user registration disabled
npm error A complete log of this run can be found in: /Users/*********/.npm/_logs/2024-09-23T22_19_13_185Z-debug-0.log

Here's my part of verdaccio config

  htpasswd:
    file: ./htpasswd
    max_users: -1
    algorithm: bcrypt

---

What I'm trying to do is allowing logins only from manually added ones(which is on htpasswd) and disable registration.
I tried max_users: 0 before and it was allowing registration by npm adduser command, which I don't want to allow.
Any other solutions welcomed.