Copy failed
Affiliation referrals UI shows copyFailed when writing the referral link to the clipboard fails.
Why this happens
Browser blocked clipboard access (permissions, insecure context, or extension). Not a server/affiliate configuration error. Distinct from webmaster Could not copy.
Diagnose and fix
1. Allow clipboard permission for the site; retry Copy.
2. Use HTTPS; some browsers require a secure context.
3. Select and copy the link manually if the button keeps failing.
4. See Affiliate promo links (?aff=).