Looking for logging into the Sharepoint Admin 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 Sharepoint Admin site. After that you can login as usual with your login credentials.
https://docs.microsoft.com/en-us/sharepoint/manage-site-collection-administrators
https://docs.microsoft.com/en-us/office365/admin/admin-overview/about-the-admin-center
https://community.spiceworks.com/topic/486316-need-the-url-to-access-sharepoint-admin-center-for-office-365-small-business
https://support.office.com/en-us/article/sign-in-to-sharepoint-online-324a89ec-e77b-4475-b64a-13a0c14c45ec
https://www.office.com/
https://btbusiness.custhelp.com/app/answers/detail/a_id/40392/~/how-do-i-log-in-to-the-office-365-admin-centre%3F
https://sharepoint.stackexchange.com/questions/122734/sharepoint-online-admin-center-url/122741
https://sharepointmaven.com/how-to-access-someone-elses-onedrive-account/
https://searchcontentmanagement.techtarget.com/definition/SharePoint-administrator
http://www.apptix.com/support/apptix-control-panel/login.aspx
https://www.linkedin.com/jobs/view/sharepoint-administrator-developer-at-login-consulting-services-inc-949770686
https://sharegate.com/blog/ultimate-guide-deal-with-office-365-external-sharing
https://www.bu.edu/tech/services/cccs/collaboration/sharepoint/login/