Hello there,
If a Windows Resource Protection (WRP) or respected file is missing or is corrupted, Windows may not behave as expected. Run System File Checker (SFC) scan to fix any corrupt system files.
On the server side, check whether any of the following issues occurs:
-The static IP Pool is exhausted.
-The DHCP server for the RRAS is not available or its scope is exhausted.
-The static IP address that's configured in the Active Directory user properties can't be assigned.
Please follow additional Troubleshooting from the below links https://learn.microsoft.com/en-us/troubleshoot/windows-server/networking/troubleshoot-error-720-when-establishing-a-vpn-connection
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