EDIT2: After reading around I found a thread here that seemed to indicate what the issue was:
And so I set it to ignore and I got this after it started rescanning:
I also set the devices to “introducer” and “auto accept”. I don’t know what those mean but it sounded vaguely like it was giving the devices to more fully share the permissions on the folder etc.
I think this is a great product but perhaps there is some work that could be done on cleaning up the documentation etc. Some of the wording of the copy in the app itself is also a little confusing.