Hi,
thank you for letting us know. The issue happens only for certain Sonoma devices, I have seen support packages from two Intel Macs. I wasn't capable to reproduce it on the devices I have available, regardless of the architecture. We have asked Apple and the advice was adding com.apple.developer.networking.networkextension entitlement, normally needed only for the system extension or tunnel packet provider features. I will add the entitlement and release an update this week.
The issue affects only IPsec/IKEv2 VPN protocol. If you switch the protocol in the application settings to Mimic, you will be capable to use the service in the meantime.
I'm sorry for the troubles caused to you. Best regards,
Martin