Zerotier no longer working


I have been using zerotier on an openwrt-router for quite some time.

The router had internet access via a cable-modem and this has changed: It now has internet-access via an LTE surf-stick.

The problem now is that all zerotier connectivity is gone. The device cannot be reached from any other device from the zerotier network nor can it reach any other device (ping and ssh).

Zerotier works fine on my phone (also lte) so lte as such should not be the issue, however on my openwrt device I am using a different provider.

So I am assuming that either there is something wrong with the configuration of the device or the lte provider is blocking zerotier…

How can I troubleshoot this?
Many thanks!

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