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@Michael_Mia, @Nick_Noakes, and @Lee_Campbell,

It looks like the challenge you described is now a known issue (#2478114), which is actively being worked on and expected to be resolved by 8/4/2021:

For now, Keap offers the following 'Alternative Solution: “On the error message screen you will clear your cache and cookies and hard reload the browser page (Shift F5).”

If you want, you can navigate to where you can submit a report so you can be notified once this known issue has been resolved.