Using ZeroTier for accessing Sentinel license not working anymore

Hi everyone !
I am an engineer for a small engineering company with 2 office locations.
We have a PC on network 1 that runs Sentinel License Service for dispatching the tokens of a few RFEM and Graitec licenses for a greater amount of users on the local network.
For 6 month I used to have a remote PC on network 2 that had access to these softwares thanks to a ZeroTier connection between my PC and the central one.
Then suddenly one day nothing works anymore.
I reached the software’s editors and they could not help.
Has anybody an idea of what could cause the issue? Tell me if you need any information.
I tried looking at firewalls but found nothing.
Thanks a lot !
(And excuse my poor English)

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