QuestDB Plugin "Health check failed"

recently trying to get the new QuestDB Plugin to work.
My QuestDB runs in a docker container, and the port 8812 is enabled.
Grafana runs localy on my Laptop.
When trying to get the Data source working im following this link. First thing i recognized was that the username in QuestDB should be “admin” and not “user”

When click the “Save&Test” Button Grafan says “Plugin health check failed”

I have tried as Serveradress: localhost, myIP, 127.0.01, and host.docker.internal. Nothing will work. Because this Plugin is rather new, i also couldnt find similiar problems online.

Would be a blast if anyone could help me