Meta Private app distribution: How to add 1 organization to multiple release channels?

I currently have an account for both MQ for developers - private app distribution and well as a managed organization in Quest for Business, which hosts devices for end-users and internal staff.

I'm trying to add my organization to a second release channel so that internal staff can perform Beta testing prior to release however I'm met with the error indicated below. 

Is there a workaround for this?