o365 Bulk Add
Time To Reply asks for: offline_access, user.read.all, directory.read.all, mail.read
Permission reference: https://developer.microsoft.com/en-us/graph/docs/concepts/permissions_reference
User.read.all: Allows the app to read the full set of profile properties, reports, and managers of other users in your organization, on behalf of the signed-in user.
Directory.read.all: Allows the app to read data in your organization’s directory, such as users, groups and apps, without a signed-in user.
Mail.read: Allows the app to read email in user mailboxes.
o365 Individual Add
Time To Reply requires: offline_access, user.read, mail.read
Gmail Individual Add
Time To Reply requires: readonly