Is it possible to use AirDrop and Sidecar with a mac on a VPN?
(This solved my similar issue with Airdrop, not tested Sidecar yet.)
I do not have VPN at router but on individual devices, so VPN broke my iCloud copy/paste and airdrop. It may be because they were not &quot;sharing&quot; the same wifi network anymore, as in, they had two different data tunnels, and the only solution I found was to deploy VPN at router or to turn off VPN.
I dig Mullvad VPN Mac app preferences, and found that there is an option to enable &quot;Local network sharing&quot; that allows local network access to connected devices. I turned it on and voila, I had my airdrop back. I believe that major VPN providers' Mac app has this function, and if you toggle this function, you can get your problem solved.
ps.: I strictly use Wireguard protocol, not OpenVPN. Not sure if it has anything to do with it, just saying...