Hello Everyone,
I just need some advice here.
When working with Feature class where domains applied to subtypes, I found domain list is missing in the Field Maps.
For example, I have a feature class with three fields - one subtype field and two text fields named 'species' and 'condition'. 'Species' has three different domains applied, each relevant for a subtype. 'Condition' has one domain applied for all subtypes.
This is what the schema looks like:

- The feature class is created to collect data in field using Field Maps. Therefore, I applied Unique value symbology using the subtype field "ObservationType", symbology classes correctly populated. However, I require to add one more field to symbology be it 'species' or 'condition'. As soon as I add another Field, the symbology classes disappear from the Symbology Pane.
- This issue is reported in BUG-000173677 for ArcGIS Pro
- Following the workaround suggested in the Bug-000173677, I added two points for two of the subtypes. This triggered the symbology classes to appear for the two subtypes. Then I published the feature class.

- I then created a Web map using this feature layer.
- When I opened this Web map in Field Maps to collect data. I noticed my two symbology classes are available, I selected Flora,Banksia sp. option to collect point but I could not see any dropdown list or a description. The fields were only prepopulated with the default codes for subtype and domain.

I tested applying symbology using two fields on different datasets with similar schema but cannot get a dropdown list for domains in the Field Maps.
BUG-000170959 for ArcGIS Field Maps and BUG-000173994 for ArcGIS Field Maps report the issue.
Also posted on Esri Community in July 2024 Symbolising Feature Layer by Two Fields Wipes Away... - Esri Community.
Is this an expected behaviour?
I could not find any documented limitation around applying Unique Value symbology using a subtype field and an additional field, when domains are assigned at subtype level.
Am I missing anything?
I really appreciate if you can share any thoughts, advice or experience of similar issue.