Start minetest service -> permission denied

I run yunohost on a preconfigured VPS server (ecowan). Until now, I had started luantiserver directly from terminal, having mods, config and world files in /var/www/minetest. Rebuild the sys today and deleted minetest, reinstalled, world, config and mods now in /home/yunohost.app/minetest/.minetest as given by the installation help.
Checked, that owner:rights are all set to minetest:minetest both in /home/yunohost.app/minetest/.minetest and in /var/www/minetest.
When I start the minetest service, it stops with bin
minetest.service: Failed to execute /var/www/minetest/bin/minetestserver: Permission denied
The rights are
-rwxrwxrwx 1 minetest minetest 6136768 17 mai 19:05 luantiserver
lrwxrwxrwx 1 minetest minetest 12 17 mai 19:05 minetestserver → luantiserver
Any idea, what’s wrong in my config and what to do here?

Can you share the output of sudo namei -l /var/www/minetest/bin/minetestserver