I believe the 'TAKE CONTROL OF CHARACTER' control assignment is only mapped on the default "Keyboard 2024 Transversal" preset. So, for example, if you have a custom preset set up for the PA28s, or if you're using the "Keyboard 2020 Transversal" preset, then the 'TAKE CONTROL OF CHARACTER' control assignment may need to be manually assigned.
Control assignments can quickly get confusing in MSFS 2024 with the ability to have different presets between aircraft.
Mark - Just Flight