Have you downloaded Pulse Secure? You could download that see how it goes. It’s very straightforward and requires the login details you would normally use when logging into your corporate private network.
Try that and reply to this thread how you get on! 😊
EDIT: When using a VPN it can prevent you access the internet on a wider spectrum since you’re attempting to tunnel into your corporate network. Perhaps having 2 VPN Clients is causing problems. If pulse secure offers no solution, try uninstalling all clients and restart.