Easy solution, but interesting problem! You need/want to schedule the "Element ID" field - which will be editable.
My old schedules that used the old "ID" field were converted when opening in AC 21 to use the "Hotlink and Element ID" field that you're seeing - and which is not editable. A bug in their file conversion process I think since the now-named "Element ID" serves the same function as the old "ID" field.
One of the forum moderators
AC 28 USA and earlier • macOS Sonoma 14.7.1, MacBook Pro M2 Max 12CPU/30GPU cores, 32GB