Let’s Encrypt provides you with a free certificate, which is how your site would be accessible via HTTPS after installation.
It’s possible that your re-installations have used up your 7 day issuance quota for skuvault.social. If that’s the case your only options would be:
- Run without HTTPS (bad, don’t do this)
- Wait a week
- Use a different domain for setup (this will create headaches down the line)
- Purchase a certificate (don’t do this)