Just came across this and wanted to confirm it's working for me as well. Also with a Cloudflare issued cert. Thanks for this, a great development!!
I'm using the HA companion app. I have a Cloudflare mTLS client certificate. I don't use Cloudflare tunnel, I use a traefik reverse proxy. I know how to install the mTLS cert in the app. Does anyone have any instructions about the traefik setup? Thanks in advance.