If you experience the below warning message when selecting the calendar tile within MyDay then read through this article.
Error:
Symptom: No O365 events coming through but i can see events on outlook.com.
Explainsation: “email failed to retrieve data” means that there’s no data for myday to pull and push through to your calendar.
Steps to resolve:
One way to resolve this issue is by re-consenting on the myday office 365 app itself on Azure. Elveio guide - https://collabco.elevio.help/en/articles/154
Access Permissions - Check if the account receiving the error has a shared mailbox with multiple users. Best to check calendar permission and remove the duplicate user entry.