Password Manager Won't Accept Renewal Code

I got password manager as part of a subscription purchased just over a year ago. More recently, I purchased an upgraded subscription, and I assumed it would include/refresh my password manager subscription. However, when I recently tried to open Password Manager, it told me I needed to renew my subscription. There was an option for entering an activation code, which I chose. I entered my code, but it didn't work. I was simply given an error that said: This Activation Code has already been used. Please contact Trend Micro for help. I tried with support, but they were less than helpful and couldn't resolve the issue at all. I store all of my passwords there, so this is a major problem for me.