GSuite emails (myemail@mydomain.com) on occasion have problems linking channels to TubeBuddy.com.  They get a no channel found or access denied error.


Possible workaround


1) Give a non GSuite email (myemail@gmail.com) channel manager rights to the channel using these instructions 

https://support.google.com/youtube/answer/4628007?hl=en


2) Log in to TubeBuddy.com with the non Gsuite email account.  Click the "Add Channel" button and select the Gmail account, then select the channel you want to link to TubeBuddy.