Hey there! @danfelix, i’m sorry to hear that your having issues controlling on-boarded devices using Bixby voice.
I wanted to provide you with a link to this article that has some suggestions for issues with controlling devices using Bixby voice: Meross smart plug - #7 by SamsungZell.
I’d double check the recommendations from that article to see if the symptoms persist, you can also reach out to the support team for the New Bixby for additional recommendations for Bixby-related features.
The New Bixby Contact Info: 800-726-7864
I hope this message finds you well!
^SamsungZell