Unable to ping devices on VPC through Zerotier EC2 Gateway

I followed the instructions to setup an EC2 gateway in this article
ZeroTier to Amazon VPC Gateway - ZeroTier Knowledge Base - Confluence (atlassian.net)

However whenever I try to ping to devices across the VPC, it is unable to communicate. I tested a traceroute and found that it just goes to the Zerotier host, but fails every jump after.