Rode smartLav+ with FP3

Hi! Got a new Rode smartLav+, but when I try to record with it I only get silence. As I understand it, both the mic and the FP3 are on the AHJ/CTIA TRRS format (I tried an OMTP adapter anyway, and it didn’t work). Has anyone else got this lav mic to work with the FP3? (I also removed phone cover to ensure secure connection)