Hi,You can provide access to an admin user in your Exchange online organization by following the steps below: Following steps will add Quarantine role to a custom Office 365 role group and add the required user as the group member.
- Signs in to Office 365. Go to Security and Compliance Center
- On the left area, click Permission.
- Create to create a new role group, give a name to the group
- Add Quarantine role.
- Add the specific users as group members.
- Review and save.
- Now the user can visit Office 365 and go to the Security and Compliance Center.
- On the left, expand Threat Management, choose Review, and then choose Quarantine.
- They could find and release quarantined messages as required.