VPN not working after 13.3.1

Your IT department is who you need to work with till resolution.

Technically, they should be testing macOS version updates before allowing the fleet to upgrade. In managed device terms the IT department should defer updates which delay them a week or two so they can identify any problems with an update breaking things. The urgency of said update including fixes for zero day vulnerabilities in the wild determines how quickly they react in a well oiled smoothly running IT department.

They may need to upgrade your VPN client to a newer version but they need to make sure that still works with the backend server side of the VPN solution. But this isn't something you should be fixing yourself and you probably don't have the access privileges to do so.

Assuming the current version is in use here, and update if not, the IT department will want to contact the VPN vendor. For a fairly common VPN usage case, Cisco AnyConnect, contact Cisco support.

I cannt make calls and connect to a server? Help

me please

Please open a new discussion post. Include the model and year of your Mac. Other details such as what are you trying to connect to and how.