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I’m not safe

When I add the lift master opener in app, it said it has been registered

I bought a house which has a lift master 8550 installed by previous owner. The previous owner once told me (when I was hunting the house) that he can open the garage door on his iphone.

Right now, I tried to follow the manual to setup the lift master opener in myQ app, I can't add my serial number. Now I have a few questions:
1. How can I add the serial number? via customer service or other way?
2. can the previous owner still open the garage door on his iphone? I guess once the serial number is under my account, he should not. 
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