SMART Tank Cashback web site not working correctly - serial number says wrong format

[barnesd1]

I purchased a HP Smart Tank 5105 and if you go to this link https://h41201.www4.hp.com/WMCF.Web/uk/en/promotion/13053/Home/ it says you can get £20 cashback.  However the web site does not work correctly.  I have tried to submit my serial number that is definitely correct as I can see my it in the HP Smart app as well as on the box and on the printer label. Then I raised an online case with HP, case Edited, who told me to ring sales on Edited.  They told me to ring  Edited who then told me to ring HP offers on Edited but this number is not valid.  It a bit of a shambles.  Has anyone managed to claim this?

[Kuroi_Kenshi]

Hi @barnesd1,

Welcome to the HP Support Community! 

We're here to help you tackle that malfunction! Don't worry, we've got your back! 

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We're looking forward to helping you resolve this issue! 

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Best regards,