ZeroTier running on Google Cloud AppEngine

Has anyone succeeded to set a vpn connection from GCP App Engine flexible with custom docker image (based on zyclonite/zerotier) to zerotierone private network?
Zerotierone requires to create a new virtual network interface but GCP does not allow to modify network interface.

Trying to start docker I receive the following error:
zerotier-cli join 159924d6300xxxxx:
zerotier-cli: missing port and zerotier-one.port not found in /var/lib/zerotier-one

Any clues?

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