Hi Matteo,
I would request you to download and share the field diags of v3000, further which I can share engineering comments.
Can you ensure site name, node names that you have configured are not having space as part of their string.
In parallel, can you take a look at below 12 mins video - that clearly explains to successfully bringup PTP link using two V3000 nodes.
60ghz-cnwave-installing-a-standalone-ptp-link
Note: If you still need assistance, please reachout to me (prasanna.tm@cambiumnetworks.com).
Thanks