Thanks for visiting the Community, Cliff_O,
I'm here to share some details about the wholesale billing account.
We currently have an ongoing issue where some customers are unable to add a client to wholesale billing account. Our product engineers are working diligently to come with a resolution.
We'll need to put you on a notification list. This way, we'll be able to communicate with you when a fix is available. Please contact us using the information on this link: How and when can I contact Support? (US only).
I'll also keep you posted on this thread as soon as an update is received.
If you have follow-up questions, feel free to let me know. I'll be here and ready to help anytime. Have a great week.