yes - exactly the same issue. There seem to be a lot of us getting the same error message. Seems to be a CC issue and hopefully they will see our messages and get it resolved!!
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Looks like other people are having the same issue....I logged back in to do a small final edit to a campaign going out in the am, and there's a weird error message. Error getting campaign activity by activityId 23d92729-016b-42d7-9ece-370788d8660b: undefined
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