Here's the invitation: forum post
I'm able to reproduce this with the latest Android build though, so I don't think the TestFlight release will help. (At least not until the issue is fixed, which will hopefully be soon!)
This might help:
- Do an initial sync on iOS (get it to a state where things aren't working correctly, but it says everything is synced)
- On the Mac, export one of the notebooks that isn't syncing as JEX
- Re-import the notebook on the Mac (so there's two copies).
- Sync again
The imported copy of the notebook might sync (see issue comment).
Edit: From the Mac, the following may help:
- disabling note history (settings > note history), then
- going to "Syncrhonization" > "Advanced" > clicking "Re-upload local data", and finally
- reinstalling the iOS app
This will take a long time, so I don't currently recommend it.