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I’m running into the same issue - when I select “This observation” under the Follow dropdown on an observation, the loading symbol shows up for a brief (but variable) amount of time, then disappears without “Unfollow” appearing. Following observations still seems to work like normal in Identify, though (including for observations that couldn’t be followed from the observations themselves).
Had the same issue, but was on an observation of someone I am already following.
Before this you could “follow” the observation as well as the person.
I think my issue is probably related; I am unable to unfollow any observation that I have placed an identification on. More descriptively, clicking the “Unfollow this observation” command leads to a brief spinny-wheel, lasting a second or two, without any evident change (i.e., option to unfollow still displayed).
This began 04/25/21, and seems to apply to all observations as far as I can tell.
Browser interface is Safari 13.1.2 on High Sierra 10.13.6