Response received from Samsung after I emailed the promotion
Thank you for your email.
Apologies for the difficulty you are facing in trying to access the claim form.
This is an issue we are aware of and Samsung technical team are working hard to resolve it as soon as possible.
We appreciate your patience whilst we work to rectify the issue.
If you have any further queries, please do not hesitate to contact us.
Ellen @ Samsung Promotional Support Team
It is a known issue apparently. Not to panic, we have until April to put through the Claim.
Don't let this ruin you from enjouing your new Phone. I am Loving my S10+ 😊