'You do not have permission to access the requested page' after ELK Docker Compose tutorial

[JaspervLeeuwen (Jasper van Leeuwen)]

I have followed the guide on installing the Elastic Stack using Docker Compose (Running the Elastic Stack ("ELK") on Docker | Getting Started [8.0] | Elastic). When I try to sign in Kibana using kibana_system as username and the password I put in the .env file, it shows the message: 'You do not have permission to access the requested page. Either go back to the previous page or log in as a different user.'

Am I doing something wrong? How to enter Kibana? Thank you in advance.

Log:
es01_1 | {"@timestamp":"2022-02-14T16:53:30.125Z", "log.level": "INFO", "message":"Authentication of [elastic] was terminated by realm [reserved] - failed to authenticate user [elastic]", "ecs.version": "1.2.0","service.name":"ES_ECS","event.dataset":"Elasticsearch.server","process.thread.name":"Elasticsearch[es01][system_critical_read][T#1]","log.logger":"org.Elasticsearch.xpack.security.authc.RealmsAuthenticator","Elasticsearch.cluster.uuid":"LWRdGxHmStC4Lo5NR6DtGA","Elasticsearch.node.id":"i80kAs8dRNuotgvptZApCA","Elasticsearch.node.name":"es01","Elasticsearch.cluster.name":"docker-cluster"}

[TimV (Tim Vernum)]

@JaspervLeeuwen

When I try to sign in Kibana using kibana_system as username and the password I put in the .env file

From the doc you linked to:

You must use the ELASTIC_PASSWORD value for further interactions with the cluster. The KIBANA_PASSWORD value is only used internally when configuring Kibana.

You should not try to login to Kibana using kibana_system that is a user that is internal to Kibana and is not intended for users.
You should log in to Kibana as the elastic user.

[JaspervLeeuwen (Jasper van Leeuwen)]

Logging in using elastic as username and the password I put in the .env file doesn't work either. In contrast to logging in with kibana_system it shows the message: 'Username or password is incorrect. Please try again.'.

Also using just kibana, the containername, clustername or nodename as username and/or using the password I put in the .env file as elastic password or changeme doesn't work.