Exchange 2019 and WAF configuration - how to get ActiveSync working ?

Dear Sophos support team,

there have been several requests about this topic, but digging through them didn't provide a proper solution.
In the past Sophos provided a guideline for the UTM how to publish an Exchange server with WAF.

I did not find an equivalent for the XG.

So can you please provide a guideline how to publish Exchange over XG WAF with ActiveSync working and keeping WAF as secure as possible ?
Any help is appreciated.

Best Regards

Edited TAGs
[edited by: emmosophos at 6:24 PM (GMT -7) on 4 Oct 2021]