Device goes offline immediately after joining the fleet

Hi everyone,

I am new to openBalena but would really like to use it. I’ve set up my server and have access to it via the balena CLI on another device according to the Getting Started Guide. After configuring and flashing my balenaOS image, I would like to add my first device to my already created fleet. The image boots on my Intel NUC and I see the balena logo. Using the balena join command I can add the device to my fleet (Device successfully joined), but when I use the command “balena devices” it shows up as offline and idle. When I try to push my docker container I get the following error:
Retry “Supervisor API (GET http://192.168.1.111:48484/ping)” after 2.0s (1 of 5) due to: Error: connect ECONNREFUSED 192.168.1.111:48484.
Whenever I try to connect to the device via the command “balena join” a second time, I get the following error message:
Caused by:
0: https://api.DOMAIN/os/v1/config: Error attempting to connect: Failed to lookup address information: Name or service unknown
1: Failed to lookup address information: Name or service not known$.

The devices are connected via a Fortigate switch and they have a DNS server with the appropriate entries (the DOMAIN is accessible via ping).

Can someone please help me?

UPDATE: I went through all my settings again and there was a problem with my DNS server. Sorry for the noise.

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