This article explains how many Learners can be assigned to a single course at the same time
Course assignment through learner credit can be used for a single learner or for dozens of learners at the same time. The number of learners that can be assigned will be restricted by the remaining balance of an organizations’ learner credit budget.
For more information or assistance with Learner Credit Course Assignment, submit a support ticket to enterprise-support@edx.org, or reach out to your account manager (where applicable)