Hi all! This thread had been an invaluable resource, so I wanted to report back. We are platinum AP holders, paid in full, from Canada. My dh has a My Disney Experience account, and both of our AP's are linked to it.
A couple weeks ago, he received 1 email that had a link for cancelling. However, there was no name in the email, so we had no idea whose AP we were cancelling by clicking it. After clicking, we did get a confirmation email, but again, no name. I emailed Disney, and got a response a week later. She said that BOTH of us should have received separate cancel emails. Since we only got 1, only 1 of the passes had been cancelled. We had to call to cancel the other one.
We did that tonight. We only waited 45 minutes to get through. The CM went ahead and cancelled both passes. He couldn't tell which pass had been cancelled through the email, so he just processed both. We have since received a confirmation email, but just like the first one two weeks ago, no specific names are mentioned. Hopefully it went through ok!!
Good luck, everyone!