After I upgraded to 2021.4.0, if I RESTART HA, the first time, after HA restarts, I have to use the “Remote” option, thru the Nabu Casa website.
Pre 2021.4.0, I was able to use the “https://(my key).ui.nabu.casa” url directly, to get in. My username/password, was saved, so I would get right in. Now after the update to 2021.4.0, thru .4.3, when I use the url above, it gives me the screen that says, “Retry” with the statement to try and login thru the Nabu Casa website.
And actually I don’t have the issue anymore. It turned out that for some reason the switch for automatic reconnection to Nabu Casa was turned off. This is not something I have done on purpose, but after switching it back on my instance reconnects after each reboot again.