I made a few tests with hass.io 0.76.2 and 0.77.0b4
You have to:
- Stop HA (Services -> homeassistant.stop)
- Rename or delete the .storage folder
- Clean your browser cache and close it, also delete some cookies you have from HA.
- Start HA, you’ll get the Login to create an user account
- Login with that user
I had to restart the browser and login three times to get the “Save login” popup. (Firefox)
Maybe helps others.