VPN and mobile app

That's a problem with your VPN, not the simplisafe app.  Mine works fine through a VPN.

iOS 13.5.1, SimpliSafe app Version 2074.31.0.  No issues using the VPN.  Check with your VPN provider, as all VPNs are not created equal.

The issue is that something changed. I've had the same VPN that worked for 3 years. Nothing changed publicly with my VPN, but I did get an update with Simplisafe 3 days ago that made it stop working....