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How to query AGOL FS by string?

Question asked by tpcolson Champion on Jul 11, 2018
Latest reply on Jul 11, 2018 by tpcolson

I have tried every syntax possibility of 

and every option possible from Query (Feature Service)—ArcGIS REST API: Services Directory | ArcGIS for Developers yet the only result I get is 

{   "error" :    {     "code" : 400,      "message" : "",      "details" : [       "'Invalid field: Trail Located by GPS' parameter is invalid"     ]   } }

Yet I can query, for example, on OBJECTID = 1

Same result with hundreds of feature services. Surely I'm missing some really obvious syntax rule?

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