Starting overnight all my scheduled refreshes have been failing. Manual refreshes from the service also fail. I can refresh from the desktop app, and I can republish with no trouble. Seven datasets have failed so far. They all give the same error message in the refresh history: "Exception of type 'Microsoft.DataProxy.Exceptions.HybridException' was thrown." The only other thread I can find on here asking about that error message never came to any conclusion about what caused it. So that's...super helpful.
All of these datasets have previously successfully refreshed at least once since the last time I published them. Most of them were published months ago and refresh multiple times per day, so there's nothing new that should cause this. My gateway is online and visible from the service.
I see that there is a known issue in Nothern Europe causing refreshes to fail, but I am in the eastern United States, so either this is a different problem, or that problem is not limited to Europe.