I think I might have found the issue and it isn't pretty. Encryption Method Client VPN uses the L2TP/IP protocol, with 3DES and SHA1 respectively as the encryption and hashing algorithms. As a best practice, the shared secret should not contain any special characters at the beginning or end. from https://documentation.meraki.com/MX/Client_VPN/Troubleshooting_Client_VPN My Shared Secret has a special character as described and was chosen by a Cisco certified partner 4 years ago. I will test this after hours soon . If this is the issue this means we have to touch every device with a VPN client unless someone knows another way.
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