How can I use Cloudflare Advanced Zero Trust Login with Google Assistant integration?

Hello,
I tried to activate Cloudflare Advanced Zero Trust Login to secure my Home Assistant since I use Cloudflare Tunnel to expose it. However, with Google Assistant, it gives me an error because it can’t handle the login created by Cloudflare to protect the app. Do you know if there is a way to fix this? Can we discuss to find a solution? I am available to do tests until Monday.

As you figured out yourself, it is Google that do not know how to use Cloudflare’s tunnel.
There is nothing HA can do to change that.

not really, here we talk about having an MFA for accessing the app, without MFA it works and from what I understand the Home Assistant APIs no longer return JSON, but the login page given by Cloudflare or the provider used