789's are often caused by the large Windows Updates deleting the PSK or changing the authentication to something other than PAP.   Delete the VPN connection and re-create it.   You could also try my client VPN wizard which uses the VPNv2-CSP engine in Windows 10 which does not seem to have these issues. https://www.ifm.net.nz/cookbooks/meraki-client-vpn.html  ... View more