Could you please tell us if the Samsung account that you are using have got any previous
(same) offers for other devices, or if you have current subscribe with these apps?
For the Premium Offers; offer only available to customers who are not current YouTube Premium, YouTube Music Premium or Google Play Music subscribers, have not been YouTube Premium (formerly YouTube Red), YouTube Music Premium, or Google Play Music subscribers nor participated in a YouTube Premium (formerly YouTube Red), YouTube Music Premium or Google Play Music trial before.
You can Open the YouTube app on your Samsung Galaxy device. Go to your account / profile and log in or create an account. Tap GET YOUTUBE PREMIUM. Select TRY IT FREE, complete sign up, and start streaming. Terms & conditions apply.
If the issue persists, you may contact us through our support channels for further assistance. Please visit the website via the below link, go to Support, then Contact, and we will assist you further with your inquiry.