No last values and graphs after mysql migration 5.6 to 8

[jfqd]

We did a mysql migration from 5.6 to 8 with export and import.

In the database I can see that new values from agents get stored.
But in the zabbix-server frontend I cannot see any new values under "Latest Data".
Also there are no graphs processed at all.

Any idea how to fix it? Thanx in advance

Debian Stretch, Zabbix 4.0.19

[jfqd]

Found the answer by myself. Changed the db-password in zabbix_server.conf, but not in zabbix.conf.php.
With everything in sync frontend is working again