In Office 365 when trying to Release selected message and allow Sender in the Exchange Administration portal is shows the following error

“You don’t have permission to open this page. If you’re a new user or were recently assigned credentials, please wait 15 minutes and try again”

It does allow you to just release messages. The issue is the user needs to be a Member of Hygiene Management and Organization Management Roles in 365  ( Under Permissions and Admin Roles )