Google Assistant not linking

Hi I’m trying to link Home Assistant to my Google account, I’ve made the test app needed but when I try to link it to the Google app it gets to “linking your [test] HA account” then drops out and says “Couldn’t update the setting. Check connection”

https://www.home-assistant.io/components/google_assistant/ - it’s at step 7 in this

(Hassio running off wifi on a raspberry pi, duckdns set up and working, all ports forwarded correctly so can connect through another network)

Hi @JKowalski, did you solved your issue?