signaturky is requiring scopes that are listed below to provide signature management features:
  • https://www.googleapis.com/auth/admin.directory.user.readonly Read access to list and view data of Users in your Google Workspace - required to provide data for placeholders in signatures
  • https://www.googleapis.com/auth/admin.directory.domain.readonly Read access to list your domains in your Google Workspace - required to apply signatures by Domain
  • https://www.googleapis.com/auth/admin.directory.orgunit.readonly Read access to list of Organizational Units in your Google Workspace - required to apply signatures by Organizational Unit
  • https://www.googleapis.com/auth/admin.directory.group.readonly Read access to list Groups and Group Members in your Google Workspace - required to apply signatures by Group membership
  • https://www.googleapis.com/auth/admin.directory.userschema.readonly Read access to data of created Custom User Attributes in your Google Workspace - required to use custom attributes in signatures
  • https://www.googleapis.com/auth/gmail.settings.basic https://www.googleapis.com/auth/gmail.settings.sharing Write access to Gmail settings of Users - required to set new signature for users in your Google Workspace (primary and not primary email adresses)