Flint Hills Association RETS Error

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RETS URL: http://manhattan.rets.paragonrels.com...

Login name: BHFRBassett2

Class: ActiveOffice

Resource: ActiveOffice

Query: (O_UpdateDate=2019-09-01+)

Error: Unknown Query Field [O_UpdateDate]

That field is in the metadata, and is indicated as searchable, but for some reason we cannot search it because its throwing the error above. Thank you for your help!