I'm having this same issue. I can see related records for a feature in the web map and in Collector Classic, but when I view the same map and feature in the new Collector, all I get is a message that the related records/features will show up when they are added. I know they are there, just not showing...
Did you ever figure out what the problem was, or if this is just a bug?
It was apparently just a bug. No more information was ever provided to me from support.
BUG-000119344: Unable to add a new related record in Collector for ArcGIS (Aurora). The error states "no collectable layers are visible".
I am having the same issue where I can see related records in the web map and collector classic, but not in the new collector. I don't believe that bug is related since I am able to add new related records in Collector.
Has anyone found a work around for this? I have successfully had related records appear in Collector before but can't get this one to work.
I worked with Esri on this issue recently, and they found that if you refresh the map on the device after initially opening the map, you will see; be able to add and edit related records. It's the initial load that is buggy in iOS devices.
This is unfortunate in that the New Collector has the ability to copy related records which is why we pushed out the New Collector...and then could not rely on it. I hope this gets fixed soon please!
We had a similar issue (04/2020) with the latest version of new Collector for iOS. Field staff added related records with no problem in the AM, but it stopped working in the afternoon. Refreshing or reloading maps did not fix it. We checked and confirmed related records could be added within the Classic Collector using the same map. However, we needed the snapping from the new Collector, so I created a new webmap quickly. This resolved the issue, but I am anxious it is going to happen again while field staff are out in the field.