Can't get the key out

A quick learner from Massachusetts says:
I just bought your 82-315 Keyed Lock and Housing, along with a mortise, secondary lock, and handle set.
It seemed to install well, but when I turn the key on the outside, I can't remove the key from the door. I can only return the key to the unlocked position, from the outside.
Is it the part's fault?
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Dave Sr. from SWISCO responded:
It sounds like the key cylinder tail is not synchronized with the lock. You might need to reinstall the key cylinder. Take a look at the related video below, this may help.
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