Does anyone have two different accounts and use two different devices?

Because I have an old work account that is linked to the old mvci hardware, and a personal account that was linked to the new mpvi3 which did work when I purchased and set it up, but now says it is registered under a different account in both accounts.

Not sure what's going on here but I can't purchase credits for the new hardware using the serial number on the interface...

Any help is greatly appreciated.