You indeed were improperly limited. For the weekend, a vast swath of new users did not get the needed tier upgrade when making their first payment.
A fix should be rolling out to these organizations, per OpenAI, not needing further payment, usage, or support contact to try to correct the condition of the account.
There really is no reason to not have “tier 1” (or better) be the default of any account. There’s no case I can see where any organization with credits to use shouldn’t have the ability to spend them freely.