If you started a Zoom / Microsoft Teams / Google Meet meeting, and you don't see the notetaker show up, there's still hope!
You can send a notetaker manually by going to one of the meeting tabs on the left-hand side of my.jumpapp.com (for example, this one), and you can click the "+" in the top-right corner, and select "Send notetaker to meeting":
Then you just need to paste in the meeting url, which you can find in your calendar invite, or in Zoom by clicking on the participants list, and selecting the option to invite other participants by sending a link.
Then click "Send notetaker," and the notetaker should get there within 30 seconds (and usually much faster than that).