Troubleshoot ODK Central 403 Error on Digital Ocean droplet

Job ID: 33237632

Budget: $10 – $30 USD

Installed ODK Central on Digital Ocean as per instructions on https://docs.getodk.org/central-install-digital-ocean/

Getting error when trying to connect:
Forbidden
You don't have permission to access this resource.
Additionally, a 403 Forbidden error was encountered while trying to use an ErrorDocument to handle the request.

Looking for someone to quickly troubleshoot :)