I think I cracked it now for me. I had to completely delete all my matter devices in the respective device app. Then I had to reboot the device so that it goes in discovery mode and from there click on “add to other app” option when the pop up occurred.
Since my bulbs require a hub for being used with another app like SmartThings or Alexa I chose as the respective partnering app the manufacturer app (in my case AiDot) to register the matter device. The key was to not directly search for new devices in the manufacturer app as this does not create and register the matter credentials.
So I went for each of the light bulbs individually through this procedure before opening the manufacturer’s app. Once I was done with the registration process triggered by the SmartThings app for all devices (bulbs) I finally went into the manufacturer app and the matter devices automatically populated.
Again, it was crucial to not open the manufacturer app directly before, which would have automatically searched for manufacturer devices and circumvented the matter registration process.
No annoying pop ups anymore that new matter devices are found in my network!
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