Yes (per your first suggestion) - IF you knew who else your client had authorized in the past, and IF you could somehow get their Rep IDs or business numbers. But the whole problem with this “ERR.73” is that there have been more than 10 authorizations for that client. I’d have to find out who all of them were - my client might not even remember - and then phone each one and ask for their Rep ID? Not gonna happen.
Per your second point - you’re right - the instant access is nice…if it works. T1013s are supposed to be the same, right? But, I’ve had cases where CRA doesn’t give instant access because they need to review or verify something. CRA says, “You MAY be given instant access, but we don’t guarantee it - we are required to respond within 6 weeks.” On the other hand, the majority of RC-59 submissions should be no problem, so this “instant access” is better than the 5-day wait when you submit online - through Represent A Client.
To be clear, the functionality provided in Tax Cycle is great! I’m just frustrated with CRA’s implementing this ERR.73, their lack of documentation about what it means, and their lack of informing everyone (even their own staff) when they did it.