I looked at the top-right corner of the AnyDesk window. There it was: a tiny, easy-to-miss . I clicked it.
First, I went to the AnyDesk website. I clicked Download and installed the free version. When it opened, I saw a screen with a nine-digit number—my address. But it also had a big yellow banner: “Free version. Limited features.” How To Activate Anydesk License Key
I realized my mistake. You don't activate before you open the app. You activate inside it. I looked at the top-right corner of the AnyDesk window