Using Delphi 10.2 Tokyo with FirePower 11.0.2
LookupDialog returns the correct field in the LookupSource but the app crashes most of the time or gives and Access Violation error.
FP 10.2.3 has the same issues.
This is only on iOS devices and works fine on Android and Win32.
Are you using RAD Studio 10.2.3? If not, please download this update. If already, please provide us a simple project with the problem as I believe our demo with the LookupDialog does not exhibit this problem.