ike authentication credentials are unacceptable

we had a T50 firewall with "IKEv2" VPN to Windows clients
We transferred the configuration to a M270. The VPN settings seem to have been adopted.
But on the Windows Clients we cannot use the VPN connection anymore. There is always the error message "ike authentication credentials are unacceptable".
Does anyone know what to do to use the VPN connection?


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