One remote connects fine, the other won't connect

I bought a 2 pack of the Genie Intellicode compatible remote. One of them connects and works fine but the other one won’t work no matter what button I program it to. I’m trying to use both remotes on the same garage door. I had already erased all remotes on the receiver. Is one of my remotes defective? Any help would be appreciated.

Maybe can you please try change battery on the remote, if it still doesn’t work, it might be defective.
Thanks.

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