Searching for firmware always results in error complaining about missing internet connection

Currently using Nuki Smart Lock Pro (5th gen) with firmware 5.8.10
When searching for firmware update I always get an error about missing internet connection.
My phone has internet connection.
The lock is connected via Thread locally, remote control disabled, no WiFi is configured.
Firmware updates have worked fine until now, being uploaded from the phone.

Could you elaborate which OS you are using and which App version specifically? and if you could provide a screenshot of the error message that would help as a starting point

Android 16
LineageOS 23.2 with microG
App version 2026.7.1 (1345)

Thanks for the quick reply, we have a possible cause, but to confirm it we would need your app logs.
You can send them to us by going to the initial screen of the App → Side Menu → Help → Contact customer support , it’s best if you add to the description that you were asked to provide logs via the Developer Forum and afterwards tell me your ticket number (via DM) so that I can directly access it!

Thanks for your cooperation

Thanks, Ticket number has been sent in DM.