When I go into the Templates option under Configure editing it will not allow me to save the template. The layer in question is being pulled from our server (not hosted online). When I go to save any changes made on the template, I get prompted to login to our portal, which I do, but then I get this error.

I have everything set to allow for editing and I'm an administrator for my organization so I'm not sure what other privileges are needed to get this to save.
If anyone has a clue as to why this isn't working, I'd be eternally grateful. I've been trying everything to get this to work and I'm all out of ideas.