I've attempted to use some of the Chatter Email Setting fields noted on the User object API, but noticed that modifying them does not affect the Email Settings shown via the UI (and vice versa, if I update the UI the values don't seem to change on these fields)

1. Are these actually mapping to the same thing, or are they mapping to separate pieces of functionality in Salesforce?
2. If they are not the same, how do you modify the Chatter email settings programmatically?

For example, I would assume that UserPreferencesDisableAllFeedsEmail would correlate to turning off Chatter emails completely for the user, or UserPreferencesDisableLaterCommentEmail would correlate to "Comments after me"

FYI, the email settings for a Community user can be accessed via the following relative path:

/_ui/core/userprofile/UserProfilePage?u=005L0000001Mtil&PersonalSetup=Notifications&psArg=Personal&tab=sfdc.ProfilePlatformOverview

I've attempted to use some of the Chatter Email Setting fields noted on Community User's via object API, but noticed that modifying them does not affect the Email Settings shown via the UI (and vice versa, if I update the UI the values don't seem to change on these fields). With a standard Salesforce user, these API fields work fine, so the issue seems tied to the Community Users.

1. Are these actually mapping to the same thing, or are they mapping to separate pieces of functionality in Salesforce?
2. If they are not the same, how do you modify the Chatter email settings programmatically?

For example, I would assume that UserPreferencesDisableAllFeedsEmail would correlate to turning off Chatter emails completely for the user, or UserPreferencesDisableLaterCommentEmail would correlate to "Comments after me"

FYI, the email settings for a Community user can be accessed via the following relative path:

/_ui/core/userprofile/UserProfilePage?u=005L0000001Mtil&PersonalSetup=Notifications&psArg=Personal&tab=sfdc.ProfilePlatformOverview