Thank you for your message and welcome to the Xibo community!
The password in your config.env file is not for logging into your CMS, it is for your mySQL database. The default credentials for accessing your CMS should be:
Username: xibo_admin
Password: password
Can you try entering the above credentials and confirm if you are still unable to access your CMS?
Hooray! Great news, thanks for letting me know you’re able to access your CMS now. I hope you don’t have any more issues with your CMS, enjoy using Xibo!