Hi,
Thank you for posting in Q&A!
Have you installed any third party firewall application on VPN client and server? First please try to disable the third party firewall on both the client and server. Then you can check the windows build-in firewall logs on both sides.
According to this thread, the op found out the VPN traffic was blocked by firewall, which might be the cause of this issue:
windows-vpn-always-disconnects-after-3-minutes-only-from-my-network
Hope you have a nice day : )
Gloria
============================================
If the Answer is helpful, please click "Accept Answer" and upvote it.
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.
https://learn.microsoft.com/en-us/answers/articles/67444/email-notifications.html