Windows 10 v1803 Edge browser - will not connect to VPN

I've been looking at a VPN issue with Windows 10 v1803 Edge browser failing to complete a VPN connection. Authentication's fine, but after that I get an F5 pop-up window that says, "Waiting for Network Access Application status." Below that it gives me two options; try to launch network access again, or install/reinstall network access application. Chrome, Firefox, IE and the Edge Client work fine, and I've tried this on both F5 v13.1.0.2 and v13.1.1 with the same result. I've checked for Windows updates and don't have any outstanding on the test laptop (I understand a previous Windows update caused VPN issues, requiring the KB4103721 update to fix it).

Checking to F5WinInfo log file, I don't see events from the Edge browser attempts - shouldn't it log there?

Has anyone else run into this issue with Win10 v1803? And it was working so well before... =/