Looking for logging into the Office 365 Admin As Another User site and are not getting the correct working link for it? In such a case, you can use the links given here by searching your desired login page in the search box. If the page is present on our website then you will get all the links related to the Office 365 Admin As Another User site. After that you can login as usual with your login credentials.
https://support.microsoft.com/en-us/help/10048/accessing-other-people-s-mailboxes-in-office-365
https://docs.microsoft.com/de-de/office365/admin/add-users/give-mailbox-permissions-to-another-user
https://office365.uservoice.com/forums/273493-office-365-admin/suggestions/7497007-by-default-allow-all-global-administrators-to-op
https://searchwindowsserver.techtarget.com/answer/Can-an-administrator-view-another-users-mailbox
https://support.office.com/en-us/article/access-another-person-s-mailbox-a909ad30-e413-40b5-a487-0ea70b763081
https://support.office.com/en-us/article/add-remove-and-manage-users-in-the-new-office-365-admin-center-6e80db58-c36b-4add-b1c8-cc5135f111f3
https://www.urtech.ca/2014/05/solved-how-to-read-other-staffs-email-using-office365-hosted-exchange/
https://community.spiceworks.com/topic/375633-exchange-admin-viewing-employee-mailboxes-easier-way
https://help.bittitan.com/hc/en-us/articles/115008258668-How-do-I-create-an-administrator-account-in-Office-365-and-then-use-this-during-migration-
https://support.getjoan.com/hc/en-us/articles/115003492205-Office-365-access-rights-Global-Admin-User
https://btbusiness.custhelp.com/app/answers/detail/a_id/40392/~/how-do-i-log-in-to-the-office-365-admin-centre%3F
https://www.lucid8.com/documentation/DSWebHelp/SETUP/Creating_an_Office_365_Global_Admin_Account.htm
https://www.atwork-it.com/news/2015/how-to-setup-an-exchange-admin-in-office-365-and-use-this-account-in-delegate365/