We are a couple of friends with a shared channel. YouTube has recently incorporated the brand feature to let multiple collaborators share a channel.
Our linked account to Keymailer, which has a few thousands subscribers, currently shows 0 subscribers on the profile page.
Furthermore, we cannot receive credit for one of our videos that was uploaded via the brand, and it reads that it does not belong to the channel that is connected to Keymailer.
*update* After disconnecting and reconnecting, problems remain. While the correct number of subscribers is showing, I am unable to submit most of my videos, and they induce an internal error on KM.