Doesn't lock true outside

A handy person says:
Hi this is my patio door and I can't lock from outside I can't find a replacement
User submitted photos of a door handle set.
Profile picture of Tom
Tom from SWISCO responded:
Thanks for posting. You mention that your issue is locking the door from the outside. Does this mean the inside works fine? If so, see either our 82-318 or 82-319 (depending on your side). If the problem is with the mortise lock, see our 82-037, instead.
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