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What are possible reasons for "The layer, <layername>, cannot be added to the map," on AGOL?

Question asked by bannockcounty on Apr 27, 2017
Latest reply on Apr 28, 2017 by JQuinn-esristaff

I have a single instance where a member of the public is trying to access a web map and getting this error.  This person is completely outside my organization.  I have been unable to replicate it, despite testing the map across multiple browsers on multiple computers and my phone.  I recommended refreshing the map and clearing their cache, which they said they did and are still having problems.  The layer in question is a hosted feature layer on ArcGIS Online and is publicly shared.  I am suspecting a firewall or other security issue thanks to this blog, but that doesn't help me help them.

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