Lightroom 6 Serial Number

Hi

Just got Lightroom V6 perpetual licence & download from Amazon.com ( NOT the CC monthly subscription )

Did get the install file & proper serial number

I do get :

We are unable to validate this serial number from Adobe Lightroom, please contact Customer Support.

My Adobe ID is validated / in good standing as is my brand new Serial Number I got from Amazon.com

I am stuck there

Any suggestions ?

Thanks