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Windows, IPSec and NAT-T

I'm trying to configure VPN client on Windows OSes (L2TP/IPsec with psk) but I got some obstacles.
Environment is:

WIN VPN CLIENT <------> NAT DSL ROUTER <----------- INTERNET -----------------> ISP FW ------------> SERVER

My goal is to reach server through IPsec tunnel.
I opened udp ports 500, 1701 and 4500 on ISP FW (DNAT to Server's IP).
I also modified registry on Windows (by creating this DWORD AssumeUDPEncapsulationContextOnSendRule with value = "2", as Microsoft suggests).

I do see traffic on ISP FW, but VPN connections fails.
Is NAT-T truly possible on Windows OS with native VPN client?

Thank you
Internet Protocol SecurityVPN

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8/22/2022 - Mon