Ha Proxy SSL Offloading Exchange on 2022

[amichel]

Hi,
Publishing Exchange with offloading through haproxy works like a charm as long as the OS of the Exchange server is Windows Server 2019.
Now when installed on Windows 2022 the connections fails.
looking at the logs I see in the working configuration:

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Exchange_Frontend_Offloading~ Exchange_Offloading/MAil_Real_Offloading 0/0/37/137/174 500 679 - - ---- 1/1/0/0/0 0/0 "GET /autodiscover/autodiscover.json

While in the non  working I get:

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Exchange_Frontend_Offloading~ Exchange_Offloading/MAil_Real_Offloading 0/0/0/1/1 400 459 - - ---- 2/1/0/0/0 0/0 "POST /autodiscover/autodiscover.xml HTTP/1.1"
Any idea where I can look?
It might be because Windows 2022 enables TLS 1.3 per default but even when I disable it it does not work.
Accessing the server directly works so it is something between the Server and haproxy.
amichel