FP5 os 2.3 fail to create a VPN IPsec Xauth PSK

I’m just configuring my brand new FP5, that arrived directly with /e/ os v2.1.
First I made two updates via OTA to 2.3
Then I started install & configure all apps.
When I created the VPN I used for my router (IPsec Xauth PSK - I have no choice because of my router) all was OK.
But trying to start it crashes the VPN UI and drop me to the setting mask.
This VPN works with my FP3+ w/ os 2.3.
Someone had this problem?
Any suggestion?
Many thanks. Marco

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