@ErnstTFD,
First, you must start with the basics. From your screenshot, I can see that this traffic is not being routed correctly. I remember you once informed me that your ISP's link is configured with CG-NAT, so this seems to me to be something related to your ISP.
The settings I mentioned would be the ACLs, as the VPN configuration is relatively simple.
So I suggest you check with your ISP.
I am not a Cisco Meraki employee. My suggestions are based on documentation of Meraki best practices and day-to-day experience.
Please, if this post was useful, leave your kudos and mark it as solved.