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Join in AGOL Unable to calculate statistic

Question asked by jslauzon on Apr 29, 2020

I try to do a One-to-One Join (Field match) in AGOL and calculate the sum. Both layers are hosted feature layers.

I get the "Unable to add feature Service Definition" error. 

If I try to do a Join One-to-Many instead, it works. 

If I try to do a one-to-one but as to only keep first record, it also works...

What may be causing the issues with calculating a statistic?