I tried to cancel my IFR on the ground, but this didn't work.  I waited until I landed to switch frequencies, but I think P2A wanted me to switch when I was on the approach.  Do we have any control over this?  Thanks.

InterruptAudio in SayPhrase: AMERICAN Ninety One Altimeter is Three Zero Zero Two at Saint John Contact Center on One Two Four Point Three when on the ground to cancel IFR  05/04/2023 22:01:35
AudioInterrupts: 1 in InterruptAudio 22:01:35
 WaveOutPlayer Paused in InterruptAudio 22:01:35
ControllerChanging: True : 05/04/2023 22:01:35
ATC Speak:  AMERICAN Ninety One Altimeter is Three Zero Zero Two at Saint John Contact Center on One Two Four Point Three when on the ground to cancel IFR 22:01:35
Sug Resp:  ~ Altimeter is Three Zero Zero Two Center on One Two Four Point Three to cancel IFR 22:01:35
 

You should wait until on the ground and then just call center with "<CallSign> cancel IFR".  

What didn't work?  Changing the frequency or the Cancel IFR call?

I did not get a reply, but I'm going to try this again, thanks Dave

Dave, tried again and it worked perfectly, sorry to bother, thanks