Many times when using Microsoft Office 365 Apps for Business or Apps for Enterprise, licensing issues will occur when trying to sign in to activate the software. The following steps will allow for successful activation.
Launch Internet Explorer (start, run, iexplore.exe).
Pull down on the gear in the upper right hand corner and select Internet options.
Select the Security tab, highlight Trusted Sites and select the Sites button.
Deselect the checkbox for Require server verification (https:) for all sites in this zone.
In the Add this website to the zone: field, enter *.live.com and *.microsoft.com one at a time and click the Add button. Once the domains are in the list, Close the window.
Select the Privacy tab and select the Sites button.
One at a time, in the Address of website: field, enter *.live.com and *.microsoft.com and select the Allow button. Once the domains are in the list, select OK.
Select the Advanced button on the Privacy tab.
Ensure that the Accept radio button is selected for First-party Cookies and Third-party Cookies.
Ensure the checkbox is checked for Always allow session cookies.
Select OK to exit and OK again to exit Internet Options.
Launch Excel from the desktop or the remote (RDP) server and authenticate for activation.