License key is required
License service returned License key is required. when activation/verify was attempted with an empty key.
Why this happens
Submit without pasting the key. Distinct from invalid-key (Phase 71) or verify-failed messages.
Diagnose and fix
1. Paste the key from your xfileultra.com account.
2. Activate again.
3. See Could not activate the license key if activation still fails.
4. See What the license key does / First-run install wizard.