After purchase, you must register the license in the AnyDesk Client.
You can do that either by signing in, which automatically registers the license, or by copying the License Key from my.anydesk and pasting it into AnyDesk > Change License Key > Register license key.

On Windows with AnyDesk 9.0.0 or later, you can also register directly from my.anydesk II.
The AnyDesk application installed and running on a device, used to connect to or receive remote sessions.
A unique code used to activate your AnyDesk license and give you access to all the features included in it.
A management portal where users can check their license and invoice information, view and manage AnyDesk clients linked to the account, find more detailed information about all sessions, and more.