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This problem drove me crazy until I figured it out. I stumbled upon the solution in a forum post but, unfortunately, I didn’t save the link to share in this post

It seems that when setting passwords for MySQL when using a Docker Compose script in Portainer that the passwords must not contain any special characters.

This seemed to apply to any accounts – not just root.

I don’t know if it’s specific to Portainer or Docker Compose.

Removing any special characters worked and I was then able to login to the new MySQL instance.