DeletedUser5 I have the free guest ProtonVPN on owner and second profile. When switching to the latter, it tells me there is no VPN, and I cannot access the internet.
Proton's "Free VPN" page indicates it's free for one "device". I believe that each separate profile counts as a different device, because it has its own VPN connection. So I suspect that from Proton's point of view you are trying to use two instances of the free VPN when the limit is one.
DeletedUser5 What do I do?
I suspect they want you to pay (they are, after all, running a business). Or perhaps you could use the free version of some other VPN in the other profile.