Microsoft have released fix to update that broke windows native to Meraki Client VPN.
You must be running the Latest windows 10 21H2
check and update here for windows 10
Update to the problem is
Windows 10 - KB5010793
Windows 11 - KB5010795
Run Windows Update and it will appear under optional downloads
Download the patch from there: Microsoft Update Catalog windows 10
Download the patch from there: Microsoft Update Catalog windows 11
Microsoft released Updates 11 Jan 2022
KB5009566 (windows 11)
KB5009543 (windows 10)
This update breaks Meraki Client VPN.
Need to uninstall to fix VPN.
MS confirmed today they will fix in an up coming update. (but may take 2 weeks.)
When you uninstall this update you then need to pause updates for 14 days to stop it reinstalling.
Open a command prompt as Administrator
wusa /uninstall /kb:5009543
or Windows 11:
wusa /uninstall /kb:5009566