Not accepting my Nitro S/N for upgrade

[NextStep Support]

When I reviewed pricing last week, it accepted the S/N.  Now that I'm ready to proceed, it says "We were unable to validate your serial number..."

[Allain Umailin]

Hello @NextStep Support,

Thank you for reaching out to us through our Community Forums!

In order for me to further assist you with your concern, could you please provide the serial number of your Nitro Pro you are having issue upgrading?

To send it via private message, hover your mouse on top of my name 'AllainU' and select 'Message'.

Thank you very much in advance and I am looking forward to hearing back from you.

[Allain Umailin]

Hello @NextStep Support,

Thank you for the private message.

To further assist you with your concern, an adjustment has been made on your Nitro Pro 11 serial number so please try upgrading it again to Nitro Pro 13 by going to our Upgrade Portal.

Thank you for choosing Nitro and I hope this helps!