HTTP credential request - why?

Hi all, I could use a helping hand. I’m setting up a Graylog server with Opensearch 2.10.0 and MongoDB 6.0.
The configuration I’m doing is basic and I don’t need the ssl protocol when I connect to the server as it’s inside my network and I want to test it.
However, configured Graylog asks me for login credentials as per the attached photo:

here there is no SSL protocol configured, but I don’t understand why it asks me for credentials in a different way than in version 5.0 of Graylog

By default GL install on port 9000 - check the port or anything else running on 9000 port.

Did you get it to work?