Tailscale :: Change tailnet :: Can't login, "tailscaleUp = (URL true, <nil>)"

Wanted to change from tailnet A to tailnet B. Uninstalled the tailscale add-on, reinstalled the tailscale add-on. No errors reported. Cool.

Hit the “Open web UI” and that is not working. The log shows …
tailscaleUp = (URL true, )

Any clues, guidance, suggestions?

Thank you !!!
HA Green