Error 403 at installing on a Plesk Webspace

My Mautic version is: 5.2.3
My PHP version is:8.3.16

I tried my Mautic installation that works fine on my hetzner ubuntu 24.04 server
here: info.stefan-franz.de

to move to a webspace. I made a test url: http://info2.stefan-franz.de/
Now i got an error message: 403 forbidden.

Is anyone here who nows the reason and the solution?

After using a standard .htaccess file it worked - but not really on a webspace with plesk.
I went back to a ubuntu server on hetzner.com

Heres es my question about .htaccess - maybe one knows what command was the reason for “forbidden”