Connect phpMyAdmin no login account infos

Hi i like to connect to the Xibo DB with phpMyAdmin. i connect with http://IP:8080 and i dont know the user. The password is known.
Zhis is the error:
mysqli::real_connect(): php_network_getaddresses: getaddrinfo failed: Name or service not known

mysqli::real_connect(): (HY000/2002): php_network_getaddresses: getaddrinfo failed: Name or service not known

I install the phpMyAdmin with this guide:

You log in with the user cms and the password you set in config.env. The host you’re connecting to will be cms-db.

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