SQL Merge Replication: Cannot resolve conflict
Primary key conflicts/violations will not be resolved automatically.  You will need to manually delete one of the offending rows to get the primary key conflicts from reoccurring on every synchronization.

If you expect primary key conflicts to occur regularly then you may want to consider doing one of the following:


Horizontally partition your data by adding a location specific identifier column and extend the primary key(s) to include this column.  Then have subscribers only insert rows belonging to their partition.
Set the Merge article property @compensate_for_errors to true which sends a compensating change to the source replica to undo the failed change when a primary key conflict occurs.