ArcGIS Pro/Model Builder problem

[GaryMorris]

I am building a model that joins to feature classes and then calculates a field in one based off of a field in the other.  I am getting them to successfully join but then the model fails while it is running the "Calculate Field" tool:  

ERROR 002717: Invalid Arcade expression, Arcade error: Field not found Permits_Agg_2025_Test, Script line: 1

The fields are not populating for me to select them, so I manually entered the full field name using both feature classes but am still getting the error.

I am using ArcGIS Pro 3.6.1

Any help is greatly appreciated. 

[DavidSolari]

This might be an Arcade limitation, if you use the Python calculation mode does that work?

[GaryMorris]

No, it tells me it is an invalid field as well.

[Robert_LeClair]

Typically the ERROR2717: Invalid Arcade expression means an invalid syntax error as referenced here - 002717: Invalid Arcade expression—ArcGIS Pro | Documentation - can you provide the Arcade expression you're using?

[GaryMorris]

It is just making one filed match another field so it is $feature.fieldname.  Since it is a joined table I have also tried $feature.inputtable.jointable.fieldname