The selling point of the Trio is that it can be a Skype for Business room without requiring a laptop, so the Yealink isn't a straight replacement.
Look on the Polycom forums for how to enable hybrid registration so you can have it connected to SfB as well as a SIP server. I've never had an issue manually registering them to a SIP PBX - you won't get provisioning to work. Check you're on the latest firmware etc.