Yes, a VPN can sometimes cause activation or connection errors with services like TurboTax because certain servers may trigger additional security checks or region-related restrictions. Usually, temporarily changing the server or disconnecting the VPN during activation helps solve the issue. I’ve personally been using FastVPN on iPhone
https://www.namecheap.com/vpn/iphone-download/ recently, and my experience has been very positive overall. The app is easy to use, connects quickly, and has worked smoothly for everyday browsing, travel, and safer connections on public Wi-Fi networks.