When I try to register my POGO, it tells me it's not a valid serial number. Carmen June 27, 2018 21:28 Updated Make sure you're using a proper POGO serial number. They have six digits starting with "21". Related articles I am replacing someone and need to register POGO in my name Why do I have to enter email and password to use the app? Add / Remove a POGO to your Account Resetting your Password Do I need to use the cloud application to access the data?