I'm not finding an explanation for what criteria determines whether or not a feature layer can be used in the Map Tour. Currently, I haven't been able to generate a feature layer that works with it. I keep getting the following error:

I have read the Add map tours page on Esri, but it doesn't tell me anything about the feature layer other than it needs to be a point layer (mine is) with at least one point in it (mine has 11).
I'd appreciate some guidance here, as I really don't want to upload each point individually. Thanks so much!