Log in using your email address in office 365 and same password. If another use is logged in, you might have click on other and change/add you own email address.
Once logged in, is the IT team re-attached your old profile to the new one, the same icons, shortcut and bookmarks will be available.
If the IT team informs you it’s a new profile. Bookmarks will have to be recreated unless they were exported first.