I have several maps that are linked to csv's in Google Docs and they all stopped working sometime in the past couple weeks or months (just discovered yesterday). Each map says the csv can't be accessed or added. The same thing happened when I created a simple new csv and tried to add it to test it. Nothing has changed with sharing settings or anything else that I can tell.
Have others experienced this issue? If so, does it appear to be on the AGOL or Google side of things?
I'm having the same problem. I posted something about it a few weeks ago . . . with no reply.
It seems to be an ArcGIS problem. All Google Sheets links have been broken since January 17.