On my developper system I tried this, first following the instructions of https://www.liveconfig.com/de/…advanced.mysql.phpmyadmin
Then I tried the instruction inside https://github.com/LiveConfig/pma-sso/raw/master/lc-sso.php that are likely the most up-to-date ones.
In both cases I get: The request to verify the token failed. Please try again!
How do I debug this?