Could not copy
Webmaster sites UI shows webmasterPage.sites.copyFailed when clipboard write fails.
Why this happens
Same class of browser clipboard blocks as affiliation Copy failed, on the webmaster sites surface (verification token, URL, etc.).
Diagnose and fix
1. Allow clipboard access; retry on HTTPS.
2. Copy the value manually from the field if the button fails.
3. Continue verification upload/DNS steps with the pasted value.
4. See Webmaster sites and verification.