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The error message saying that you have to enter a Location Map URL in order to create a calendar event has reappeared. It would not let me create a new event if I left it blank and if I put one in, it would not accept it.
I tried changing the event type but that didn’t change the result.
I faced the same issue this morning - copied and pasted a location URL from Google maps, and I was unable to save it. I cleared out the Location URL and was still unable to save it with the same error message.
I opened a new tab in the browser and recreated the event, and was able to save it…