To update the existing address of a customer through the Commerce API using the PATCH method, you need to provide the unique identifier of the existing address record in the request URL.
We faced similar issue and it is seems to be a standard behaviour. You can try using a primary key such as 'Location ID' to update the existing record or customize it accordingly.
Martin Dráb230,466Most Valuable Professional
on at
It seems that it identify an existing record by the provided key values. Unfortunately it's impossible to say more without more information from you. What you can do on your own is debugging the entity.
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