Permissions for application

After registering Microsoft 365, you must grant certain permissions to the application. These permissions are required to enable Microsoft 365 packages to perform various operations.

To grant permissions to an application, see Add permissions.
Note: You must be the co-owner of the application for which you are configuring permissions.
The following Delegated permissions for Microsoft Graph are required for Microsoft 365 packages:
Common permissions
openid
offline_access
User.Read
User.ReadBasic.All
One Drive
Files.ReadWrite.All
Sites.ReadWrite.All
Calendar
Calendars.Read
Calendars.Read.Shared
Calendars.ReadWrite
Email
Mail.Read
Mail.ReadWrite
MailboxSettings.Read
MailboxSettings.ReadWrite
Directory
Directory.AccessAsUser.All
Directory.ReadWrite.All

Apart from the above permissions, you can grant additional permissions based on your requirements. See, Microsoft Graph permission reference.