Windows devices might face VPN connection failures after installing the April 2024 security update (KB5036893) or the April 2024 non-security preview update.
There's no proper fix until Microsoft pushes a patched update. However, you can work around the issue by uninstalling all the security updates.
At least one Redditor claims that uninstalling and reinstalling their VPN app fixed the problem for them, so it may be worth trying that before moving on to more drastic measures.
If you decide to uninstall the security updates, Microsoft tells you how: 'To remove the LCU after installing the combined SSU and LCU package, use the DISM/Remove-Package command line option with the LCU package name as the argument.'
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