This article explains which members you can see after their removal.
You can see all the members that are removed with the ‘Show removed’ toggle. If a member does not accept their invitation to edX, their information will not be stored and you will not be able to see them in the member tab after 90 days.
For more information or assistance, submit a support ticket to enterprise-support@edx.org, or reach out to your account manager (where applicable)