Saw a couple questions about redeeming your Buds offer through Samsung Shop when you purchased through a carrier so I thought I'd send a little help.
Download the Samsung Shop app on your qualifying device
Tap the side-bar menu
Tap My Inbox
Select Buds offer
Fill out your information
Kick back and relax
It will auto fill your IMEI to verify it's a qualifying purchase.
Okay, bye, enjoy your preorders!
And done and already got they will be shipped March 18th :-)
Used to be able to do promotions if you knew the IMEI which you could get before the phone arrived from your EIP statement but they indeed have changed it and it has to be from the S10 itself.
Manage your T-Mobile account