Grafana in HASSio with Supervisor - local guest access not working 401: Unauthorized

Hi,

I have Grafana and InfluxDB set up and working on my instance of Hassio. I want to be able to view Grafana dashboards as a guest from any device on my local network, without signing in to Home Assistant first. This is so my wife (and other guests) can view the dashboard without having to worry about Home Assistant at all.

Currently, when I try to access share link for the dashboard created by Grafana from a browser or device not signed in to Home Assistant I get the error “301: Unauthorized”

I am running Grafana 6.1.1 and Home Assistant 2021.2.3 with supervisor.

I’ve searched this forum and others, most relevant I have found is: https://community.home-assistant.io/t/401-unauthorized-iframe-card-of-grafana-not-working/148017

My Grafana config is like this:

I have tried setting a port, as suggested in the link above, but when I do that Grafana fails to start.

Help!