Watching GWENT streams, you have a chance to receive 50 Meteorite Powder or 3 Card Kegs. Drop probabilities are working correctly, and Technical Support cannot influence them.
To disconnect a Twitch account and a GOG.com account please follow these steps: unlink. Mind that the 100 Meteorite Powder reward can only be gained once per GOG.com account.
If you get a whisper on Twitch that you received a GWENT Twitch drop, make sure it comes from cdprojektred_chatbot. No other sources are legitimate.
More information: https://www.playgwent.com/en/twitch-drops