Hi Michael,
In order to narrow down the issue, I would like to collect the following information:
1. Has your Office 365 subscription been upgraded?
2. Does the issue affect all the users in your organization?
3. Are you using Office 365 for Small Business or Enterprises?
4. Could you please provide us capture a screenshot?
After obtaining the information, we will provide you further assistance.
Thanks,
Shyamal