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Says "master password" I use on another machine, same account, is wrong. Second time this has happened. What to do?

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I have set master password on my desktop. it works. It's in LastPass. It's not a matter of keying in the wrong p/w. I wanted to install FF on one of my laptops. Twice I've attempted to install/sign in with the master p/w and cannot. I'm using the same acct (email) and can sync using the sync password. So what to do? Install asked me if I wanted it set up new and I agreed.