Webex work app won't work with home internet

I work remotely two days a week and we take calls through an app called webex so it doesn't connect to our personal cell phone number, I have tried many things to get it to work without even being connected to the internet and it won't work. I've even uninstalled the app and reinstalled it. I had read on google that the t mobile home internet has issues with VPN or Voip and won't work due to packet loss and i'm not sure what that means. Has anyone had any issues with a problem like this? and what did you do to make it work. I also believe it is the internet because the app was working just fine before with my other home internet provider.

Thanks for the feedback.