The node-red-dashboard ui requires any browser accessing the GUI to authenticate itself with the username and password that was setup in the Node Red configuration upon first access via the pop out button.
However on the Android (possible apple) app from the playstore when we click on the pop out icon it opens up in our default browser on our phones ie chrome so chrome gets authorised but not the app.
This means if you have embedded node-red-dashboard ui into your lovelace HA dashboard it will not work on the app version of home assistant as it cannot authorise itself.
@frenck not sure who to report this too, is it node-red-dashboard package issue because of the way that authorisation is needed or is home assistant app issue because it has no current was of handling browser requests and heading to external browser?