Ensure you are using a current version of AnyDesk. Legacy keys sometimes struggle with very old versions of the software. License Not Showing on Remote Devices
Under the "General" or "About AnyDesk" section (depending on your version), look for the Change License Key option. how to activate anydesk license key link
Look for the official email from AnyDesk containing your subscription details. Ensure you are using a current version of AnyDesk