Rounding back to this!
I tried all of the suggestions folks posted. Colleagues on other teams couldn't open up their own notfications panels to find the library, logging in and out didn't work, checking firewall settings was a bust, etc. None of it worked for us!
Then i noticed the small icon next to the library i was trying to share. We have a corporate account. If a library was setup under my marketing group it wasn't shareable. I had to dupe the libraries i wanted to share into my personal library and share from there. That solved my problem.
Sharing an image below. Blocking out my company name to protect the innocent (Haha).
