Own openHAB Cloud with Apache Register forbidden

Hi,
I installed the openhab cloud on apache / plesk server…
When I try to register a new user I get a forbidden.
has somebody an idea where i habe to change something ?

For me the solution was to update the redis-server https://community.openhab.org/t/own-openhab-cloud-couldn-t-register-a-user/24972/15