Google nest integration with self hosted pub/sub

Hi, I’ve just swapped from an instance running in docker that was running fine for over a year to one on dedicated hardware and am having to set up all my integrations again. I am having a partIcular issue with Google Nest where the necessary steps have changed and the flow is currently missing details on creating the self-hosted pub/sub following the change made by Google. However, having the pub/sub element set up and apparently functioning when I complete the final step in the browser and it returns to home assistant the screen goes blank and the only way to do anything is to exit and return to home assistant, the integration having failed. I have tried deleting both the project and the application credentials and going through the set up again multiple times, but it always ends with the blank screen. I’m assuming that this could be to do with the changes google has made re: pub/sub, as other than that nothing is different to the previous integration I had set up as I have copied everything over. Does anyone have any suggestions to resolve or steps for the pub/sub set up for me to check against to ensure I’ve not missed a checkbox or similar?

From what I remember, the pub/sub just needs to be enabled. Nothing else that I recall.

Google have changed it so you have to self host it, but as it turns out that wasn’t the issue which I solved by redoing the flow about the 20th attempt with the app uninstalled so it didn’t launch on the final step and a new browser tab opened instead into which HA was loaded (I had already logged in on a different tab). I’m not sure why that made a difference, but it did.