I am trying to customize a Sharepoint list form using JSON.
The list has a calculated field named 'RequestID'. This field is on the form, but hidden using conditional formatting.
I am using the JSON provided by microsoft for alterations to form header. The only change I have made is
"txtContent": "='Application Change Request Form - ' + [$RequestID]"
This is not providing the proper header. It is only showing the initial words, the value in the field [$RequestID] does not appear. What mistake have I made in my coding?