Model builder: add join doesn't preserve column names

Hi,

I'm having some issues using the 'add join' tool within model builder. The output table always results in 'TableName_1, TableName_2, etc.. I would like the output to preserve the column name so it would look something like 'TableName_ColumnName'. I've tried selecting the maintain field names options but still no luck. Attached is the model jpg. Any ideas?

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