Failed to resolve proxying route for request

Hi All:

I am a Horizon Admin.

I am preparing to travel out of state, and I am planning using my cell phone hotspot to connect to Horizon.

While trying to launch an application from Horizon Workspace One using the hotspot, I am getting the following error:

https://mycompanyurlhere:8443/r/B78947B7-DCA6-42F7-860B-E3D9B9731390/certAccept.html?numPages=3

“Failed to resolve proxying route for request”

I do not get that error if I use my home Internet Service with AT&T

AT&T happens to be the provider of my cell phone also.

Any ideas why I get that error?

Any help will be appreciated.

Rene