Assuming you are eligible for the Disney+ offer i.e which phone did you choose and when @stevie1107 may I ask what is happening when you try to complete the claim ?
Dependant on your region there should be some contact us information.
The UK's is Samsung Promotional Team
Call us at 0333 016 4427https://20203.samsungpromotions.claims/gaming/en-GB/support/contact
Daily Driver > Samsung Galaxy s²⁴ Ultra 512Gb ~ Titanium Black.The advice I offer is my own and does not represent Samsung’s position. I'm here to help. " This is the way. "