Loving the new ArcGIS for Excel so far. I am however, running into the same issue with user after user in my organization. When prompted to sign in, they don't know what our organization URL is:

As an administrator, I am able to pre-configure this URL in other ArcGIS products so that when users attempt to sign-in, they see this and can simply click the big blue button:

Is it possible to do the same in ArcGIS for Excel? Being able to configure this for my organization is critical in helping all of our users get up and running faster.
Thanks!