Forbidden call of www.komoot.de

I daily use the side www.komoot.de a lot of times. In this case I always have to stop VPN because of the error-message 403 Forbidden. This is absolutely unacceptable for me. What can I do you prevent this situation ?

First, I’m an Avast user and not an Avast Team member.

There are sites that actively try to block VPN programs.

I don’t use a VPN and I am in England but I was able to connect to the site.
I don’t know if it is possible to either add an exclusion for that site i Avast VPN or use split tunnelling in the Avast VPN for that site.