I cannot check a license back in. The license is from a textbook and I am the organization administrator. See error message screenshot attached. I also shared a screenshot of the portals I am connected to.
I followed the instructions in the two articles below:
I'm logged into arcgis.com portal and the IllinoisTech1 organization portal. No matter which of the portals is set as active, I get the same message.
ArcGIS Pro cannot be set to work in online mode because the Portal you are connecting to is no longer accessible. Please contact your organization's administrator.
I have not been able to figure this out. My last resort is going to be to uninstall and reinstall the software, however, I'm concerned that if I do that, the license will be permanently stuck in the "in between" mode--neither active on my computer nor accessible from any other computers.