I have enabled Mullvad on my ASUS router using the OpenVPN profiles. Everything works well, except for Apple Intelligence. Despite my Apple ID and my iPhone's region set to US, I can't use certain Apple Intelligence features.
Features such as Safari webpage summary require connecting to Apple's servers to run the AI, and I can use it without the VPN, but while Mullvad is active, I get the "Unsable to summarize" message, which means there is a problem with the connection.
My Mullvad VPN connection is using a US server, which I did test for WebRTC and DNS leak. Everything appears to be working except for Apple Intelligence and some heavily restricted services such as Perplexity AI.
I hope the problem is only on my side and not yours.