Microsoft has fixed their issue, and our customers are reporting back that they can email again from Outlook Online.
Microsoft currently experiences issues that might affect the performance of Zivver in Outlook Online.
Please navigate to https://azure.status.microsoft/en-us/status to review the latest status.
Workaround in order to continue using Zivver:
Navigate to app.zivver.com to receive and send secure mail.
If you need any support, please reach out to support@zivver.com.