it seems that you proposal not match with its VyOS’s configuration .
Set-VpnConnectionIPsecConfiguration -ConnectionName “VyOS IKEv2 VPN” -AuthenticationTransformConstants GCMAES128 -CipherTransformConstants GCMAES128 -EncryptionMethod GCMAES128 -IntegrityCheckMethod SHA256 -PfsGroup None -DHGroup “Group14” -PassThru -Force
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you have a different configuration in your current proposal , If you want to have a debug session on Vyos run the following command:
generate ipsec debug-archive
also there is a post in our forum for linux , but it can be useful .