Azure site-to-site VPN with Meraki MX60: failed to pre-process ph2 packet

Hi,

When trying to establish a site-to-site VPN connection between Windows Azure and my on-premise network using the Meraki MX60 as VPN device i get the following error message in the event log:

failed to pre-process ph2 packetfailed to get sainfo.

Things i've already done:

• My Ipsec policy on the meraki device is set to 'Azure' and i double checked all the settings 
• The public IP matches the gateway address generated by Azure
• The PSK is correct
• The routing of the gateway in Azure is Static
• The subnets on the Meraki device are configured correctly (i've entered the private Azure subnets)
• The subnets in Azure are configured correctly (both the local and the virual one)

Thanks for reading,

-bmoonens