Google Cloud VPN to Meraki MX

Hi,

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I am trying to set up a GCP VPN to ur internal Meraki MX network. I have created a Cloud VPN Gateway and assigned a static Public IP address to it.

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I then created a IKEv1 tunnel in GCP to the Meraki MX. I have created the configuration on the Meraki side as well and used the following settings as per https://cloud.google.com/vpn/docs/concepts/supported-ike-ciphers

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IKEv1

Phase 1 - AES128, SHA1, DH 2, Lifetime 36000

Phase 2 - AES128, SHA1, PFS 2, Lifetime 10800

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The VPN tunnel turns to established on the GCP side, but the event logs on the Meraki show:

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msg: failed to pre-process ph2 packet (side: 1, status: 1)

msg: failed to get sainfo.

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The VPN tunnel on GCP then turns to First Handshake: Handshake with peer broken for unknown reason. Trying again soon.

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I am a bit lost with this now, so wondered if anyone would have any guidance.

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Has anyone managed to get Meraki talking to GCP VPN?