I'm new to GIS and just installed ArcGIS Pro 2.8 as well as the extension for ArcGIS Maps for CC. I was able to create a test map in ArcGIS Pro and export it as an AIX file. However, when I try to open it, I get a prompt to log into ArcGIS Online. I have an account via my organization and use those credentials to log in, but the login screen just goes gray and nothing happens.