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You likely have the lever that goes from the outside portion of the lock through the striker/bolt assembly into the inside portion rotated into an incorrect position when you insert it into the striker/bolt assembly.
Try loosening the bolts a few turns that hold the inner and outer lock assemblies together and work the key, locking and unlocking the lock. What you are actually doing is readjusting the fit of the two halves. Sometimes if one or the other is a bit askew, one side or the other will not operate properly. Once you have "wiggled-in", tighten the assembly, but not quite as tight. A shot of graphite powder into the cylinder(s) will improve the lock's functionality as well.
my guess is that during installation the inside lock cylinders were 1/2 or a full rotation more in one direction than the outside cylinders. remove it from the door, assemble it and try it without installing it. If it doesn;'t work, take it back. If it's old, oil it. if that doesn't work- toss it- you've spent an hour on a $15 item.
it sounds as though the linkage that pulls the deadbolt back has disengaged... if you undo the screws from the inside of the door and remove the manual knob there will be 2 more screws holding the key lock to the door. A thin flat bar is attached to the key lock that goes through the deadbolt and into the manual knob. This bar turns with the key, sliding the bolt on its track to lock and unlock the door. Once the lock is apart check the key in the lock to see if the bar turns when the key does. then see if there is anything that may be obstructing the deadbolt from sliding. The locks are pretty indestructible so if there is a problem it may have been from the install... perhaps the door is to wide for the lock to engage properly and the lock worked loose in the 6 months that it worked.
if you remove the screw from the deadbolt and remove the keyed parts you can see the plunger assembly. you can use a flat head screw driver and turn the plunger in. it will unlock the door and you will be able to replace the deadbolt