Hi AlKolwicz,
Helping us troubleshoot the issue, could you provide the following information?
1.Is there any other people who also encountered the same issue in your company?
2.About the error message when you click “site” and “SkyDrive”, please post a screenshot here for us to troubleshoot.
3.Have all the users been upgraded to Office 365 preview plan in your company?
Additionally, please check if you have assigned SharePoint licenses to all the users.
Furthermore, you can login to Office 365 admin page, click “public website” to see if you can login to the website. If there are any errors appearing, you could also post a screenshot on this forum for us to search.
Thanks,
Linda Wang