I had a system for which no providers could be created. I think it's because I used sudo to run apcera-setup. Anyway, not being able to make any progress, I followed the brute force uninstall instructions here: https://docs.apcera.com/setup/apcera-setup-debug/.
The problem is, when you then go to reinstall, you can't reuse your apcera.io subdomain, because it's already registered for your previous install, and the update token cannot be obtained (as far as I can tell) once you've deleted the config.json.
Any other alternatives to reset/reuse the sub-domain name?