Hi Philip,
What's curious to me is why my survey (with MANY nested repeats), does submit data as expected, but hangs on the submitting data screen. I have an open ticket right now on this issue (Esri Case #0200354). We absolutely need this functionality for our project, and are a bit disappointed that our Help Ticket has been open as long as it has and the analyst was unaware of such limitation.
We have upwards of 5 nested repeats in our form. As I mentioned, if we fill these all out, and submit the data does write to the feature classes/tables correctly, the Survey123 application however has to be restarted since it gets stuck on the submitting data splash window. Note, we are also updating data against our own Feature Service if that matters.
If we cannot use nested repeats, we absolutely need a valid workaround, so I am interested in trying your workaround. Any additional info you can pass along would be appreciated.
Thanks,
Chris B.