I would first make sure the Trackpad cable is fully seated into the logic board, maybe it got bumped during SSD replacement and got knocked loose.
If that doesn’t work you can try adjusting the trackpad tension screw and see if that helps. You’ll need a T6 to do this. Make a half a turn, place laptop in upright position and then test the trackpad. If it’s not clicking properly make another half turn and test it again. If you over tighten this screw you can break the trackpad so be careful.
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