I was mentioned widget issues

We originally had the “I was mentioned” widget working, but then when we built out our team, it stopped working on dashboards. Now when we try to enter it, we get the following message:

I do not believe I have an internet connection issue, as I can do other things in the system. Note that the original dash board that had this widget have it showing up as a box that can’t be deleted:

Any help on this is greatly appreciated!