A 404 on the coupon print view or the MultiPrint page almost always means stale rewrite rules — resaving permalinks fixes it in most cases.
Resave permalinks first #
Go to Settings → Permalinks and click Save Changes — nothing needs to change; saving flushes WordPress's rewrite rules and re-registers the coupon and MultiPrint URLs. Test again.
Add-ons-specific 404s #
- The MultiPrint page (
/multiple-print/by default) is a rewrite-registered URL, not a real page — if it 404s, resave permalinks. If you changed its slug under Coupons → Options → Link Attributes / Permalinks, resaving afterward is required. - Location or Vendor archive links 404ing after enabling those filters: same fix — the new taxonomy URLs need a permalink save to exist.
- Email gate access links: an "expired or invalid" message is not a 404 — gate links are valid for 7 days and are single-recipient; send the form again for a fresh link (see Email Gate troubleshooting).
Still 404? #
Work the elimination procedure in Troubleshooting Conflicts: other plugins off one at a time (rewrite interference), a default theme, then hosting. If permalinks keep "unsaving" themselves, some code on the site is flushing rewrite rules on every request — that's the root cause to remove.
