Moved to Cloudflare - Alexa Skill Linked but Server Unresponsive

I had previously setup port forwarding to access Home Assistant. I have now replaced this with Cloudflare, but am finding that Alexa Voice is now no longer working (it was working previously).

I have de-linked the Alexa development skill and in the Amazon Developer console have changed to:
https://myexternalURL.com/auth/authorize
https://myexternalURL.com/auth/token

I have checked port forward on my router: 443-8123 and 8123-8123.

The app links but it is not finding any devices.

I have checked the following:

  • Bot fight mode is inactive in Cloudflare

  • SSL / TLS encryption mode is Full (Strict) in Cloudlflare

  • I have granted access to AS14618 and AS16509

Any other thoughts of what I need to do?

Thanks.