Ensure you didn't accidentally copy a space at the beginning or end of the key.
Once logged in, the link will automatically bind your new license key to your account. Method 2: Manual Activation via the AnyDesk Client how to activate anydesk license key link
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 Ensure you didn't accidentally copy a space at