Panasonic s550bf Door Latch

Bad luck. Are you sure you mounted everything everythinh exactly the way it was? No pieces missing or left over?
Best procedure is to that a photo of each step.
My adivec: Do it agaim carefulley. I no luck, look for a repair service
Maybe you can fine a video tutorial for your Microvwve in youtube?
Something like this
.
Broken microwave door
Samsung Microwave Door Latch Spring Repair when your door won latch closed
Over The Range Microwave Oven Door Repair Help
Repair Replace bad Door Switch Mechanisms on Whirlpool Microwave


and there are come more

Common problem. Apply a small dab of lithium grease to the tips of the door hooks. You might also have to adt. the door latch switch assembly inside the oven as it could be bent out of shape from the hard to close door.

Click on this link to get to a web page from which you can E-mail Panasonic your question.
http://eng-na.faq.panasonic.com/

Possible causes - door switch, or door switch assembly out of adjustment; plastic latch guides on door switches worn; door hinge worn, causing door to be out of alignment. If it's the last one, the unit needs to be checked for microwave radiation.

If you need further help, I’m available over the phone at https://www.6ya.com/expert/david_29ad5d1dd86564b0

Hello Scott Noble - If I was in your position, I personally will recommend consulting a certified technician first for an accurate diagnosis. Depending on what part(s) is damaged from the door, the microwave could possibly have faulty switches, door switches, or latch which only a professional can repair.

see this causes and fix it. God bless you
Open Lever If the microwave door won't open the open lever might be broken. This part can be replaced separately.

Door Spring If the microwave door won't open the door spring may have broken. The door spring is located inside the door and keeps downward pressure on the door hook.

Door Latch If the microwave door won't open the door latch might be broken. The door latch is inside the microwave. The door hook, which is part of the door, engages with the latch to keep the door closed during operation. If the door latch or actuator breaks the door may not open.

Door Hook If the microwave door won't open the door hook might not be releasing properly. The door hook is installed inside the door and normally releases when the door is opened. The hook is made of plastic and will break over time. When this happens it will need to be replaced, it can't be repaired.

Button Spring If the microwave door won't open the button spring might be broken internally. The button spring can be replaced.
Button If the microwave door won't open the button might be broken internally. The button can be replaced.

Handle Actuator If the microwave door won't open the handle actuator might be broken. This is a plastic part which can become brittle over time. This part is connected between the door button and the door latch assembly.

it's a replaceable part. the upper and lower hooks are actually 1 part. door will need to be partially disassembled

Part is available,
http://www.searspartsdirect.com/partsdirect/getSubComp.pd?modelNumber=JE1640WA01&productCategoryId=0123245&brandId=0432&modelName=MICROWAVE&diagramPageId=00001&documentId=E2134524&pop=flush
Eric

I have a semmins microwave working in great condition, last night the latch mechanism inside the microwave don't allow the door latch to close.Only the top portion, bottom portion is ok.