There are a couple of possibilities that might cause what you were seeing.
First, what’s the brand and model of the master switch?
Second, when you physically press the new RA 45110 accessory switch, does the light come on? That is, does the master receive the message?
If so, does the status of the master switch change in the smartthings app?
If the answer to the second question is yes, the accessory is successfully communicating to the master switch, how did you set up that communication? And specifically did you use zwave direct association so that the accessory could talk to the master without going through the smartthings hub?
If you did use zwave direct association, then that’s the issue. That method doesn’t involve talking to the hub, which is why the accessory switch status would not update.
There are a couple of ways around that, but again, it depends on the answers to the previous questions.