Trying to register an app with portal.azure.com I had to register as a user. To prove I was human they gave me a puzzle, which consisted of the attached image. (It was an svg, which LQ doesn't allow to attach, so I converted it to a gif.) I clicked the mouse on it, tried to move it, but it wouldn't move. I couldn't figure it out. I tried the alternative audio puzzle, which was listening to 3 audio clips, choosing which had 3 sounds - dead simple. So I'm missing something simple. Does anyone recognize it?

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It's just an image that appears to mean "no robots". Are you sure it was a puzzle and not a warning?

Are you sure you're human?

Hmmm... I hadn't even figured that out.

Then I didn't know what to do. I clicked on it, and nothing happened. When I chose the audio alternative I got instructions. If it wasn't the puzzle, it was a meta-puzzle: I had to figure out what the puzzle was.

No.

Do you have an ad blocker preventing the test from popping up?

Often their code won't work with all setups, or the challenges will actually be hosted on another server that is using some funky sort of DDoS protection, preventing it from loading/solving correctly. I'd guess the picture is the default if you fail/don't solve the puzzle. I use Tor alot and see stuff like this constantly due to the above problems. Try to 'view source', on any web pages involved and see exactly what it is trying to do. I browsed to Startpage with Links on the Linux framebuffer the other day and it went nuts blocking me. Welcome to the modern interweb.

Even though Google collects information from the most-common "picture matching" CAPTCHA, you really don't need to "over-think" (or, "over-engineer") this simple requirement.

And a script blocker and an image/video/etc blocker. I turned them off.

That's a good guess. It came up immediately, before I saw a puzzle. They gave me the option of audio, which I might think they wouldn't to a robot. But what do I know.

Every time I've seen this sort of thing break, it's 1.DNS, 2.Firewall, or 3.Filter of some sort.
Could be an extension, browser preference, proxy, stale cache, corrupt browser profile, bad user-agent, bad route by isp.. you name it.
Have you checked if it works on another system?