I had to do the same after buying my S22 Ultra that got delivered on April 14. I had to upload the IMEI and got my Buds yesterday.
As far as the Disney+ claim, I couldn't complete the online form since the age confirmation tick box could not be completed. There was a claim deadline of 22 April so I emailed as many support email ids as I could, with screenshots of the form completed but for the age verification, and I got a code emailed back to me.