ConnectVideo is currently NOT optimized for agencies or multiple clients.
Currently, we don't offer sub-accounts, and we only allow up to 3 ad accounts for a single ConnectVideo account. (And we don’t have a plan for sub-accounts in our roadmap right now).
So although the number of Facebook™ pages or Instagram™ business accounts you can manage with ConnectVideo is technically unlimited, the number of ad accounts would be the limiting factor if you'd like to use it for clients.
As always please feel free to reach out to your support heroes at email@example.com if you have more questions, we got you covered.