Why won't the app stay connected to either one of my Xbox one's?

Thank you for contact us! I'm Anderson, an Independent Consultant and a Microsoft user like you.

good evening

Your account could only be connected to one xbox at a time, as soon as it connects to one it disconnects from the other automatically, when you leave that one and go to the next one and connect it disconnects in the previous and consecutively, you need two different accounts to connect to both at the same time time.

XBox One MP isn't available for me either. NAT is open, the UPLAY app connects just fine, but the in-game MP won't connect to the servers. Why is this not being addressed?

Rewards app won't work for either the Xbox One S or the Xbox Series S trying multiple internet connections and DNS servers

Same here. It will connect but it won't stay connected for very long. I have an Xbox One X but I'm sure the controller is the same.

the internal GB flash drive is the one that came with it. it is as official as Microsoft can make it. ;-)

1). why it won't stay formatted between reboots might be just one question.

2). why this xbox won't boot this latest update via any USB 2.0 stick (formatted either fat32 or ntfs) is another question.

3). why updates over the internet have always worked until recently and not now is another question.

a browse of forums shows the update over internet issue isn't narrowed to just me nor the usb issue (with xbox). though MS tech support hinted at, mind you and very slight hint, getting the latest xbox, "xbox one". not ready to that either.