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I continued debugging the issue and fortunately, I finally found the root cause and solution. Turns out the Ubuntu client wasn't updating the DHCP settings automatically, so I added the following lines to the ovpn file:

up /etc/openvpn/update-systemd-resolved down /etc/openvpn/update-systemd-resolved

And also installed the following dependencies:

sudo apt install resolvconf openvpn-systemd-resolved

With that, I was able to solve the issue and now all the clients are resolving automatically.

@girish Thank you, I can corroborate it works even if it's showing an error in the node field.