Member name	Value	Description
ExchangeAdmin	1	Events from the Exchange admin audit log.
ExchangeItem	2	Events from an Exchange mailbox audit log for actions that are performed on a single item, such as creating or receiving an email message.
ExchangeItemGroup	3	Events from an Exchange mailbox audit log for actions that can be performed on multiple items, such as moving or deleted one or more email messages.
SharePoint	4	SharePoint events.
SharePointFileOperation	6	SharePoint file operation events.
AzureActiveDirectory	8	Azure Active Directory events.
AzureActiveDirectoryAccountLogon	9	Azure Active Directory OrgId logon events (deprecating).
DataCenterSecurityCmdlet	10	Data Center security cmdlet events.
ComplianceDLPSharePoint	11	Data loss protection (DLP) events in SharePoint and OneDrive for Business.
Sway	12	Events from the Sway service and clients.
ComplianceDLPExchange	13	Data loss protection (DLP) events in Exchange, when configured via Unified DLP Policy. DLP events based on Exchange Transport Rules are not supported.
SharePointSharingOperation	14	SharePoint sharing events.
AzureActiveDirectoryStsLogon	15	Secure Token Service (STS) logon events in Azure Active Directory.
SecurityComplianceCenterEOPCmdlet	18
PowerBIAudit	20	Power BI events.
CRM	21	Microsoft CRM events.
Yammer	22	Yammer events.
SkypeForBusinessCmdlets	23	Skype for Business events.
Discovery	24
MicrosoftTeams	25	Events from Microsoft Teams.
MicrosoftTeamsAddOns	26	Events from Microsoft Teams Add-ons.
MicrosoftTeamsSettingsOperation	27	Settings changes from Microsoft Teams.
ThreatIntelligence	28	Phishing and malware events from Exchange Online Protection and Office 365 Advanced Threat Protection.
MicrosoftFlow	30	Microsoft Flow events.
MicrosoftStream	32	Microsoft Stream events.
Project	35	Microsoft Project events.
SharepointListOperation	36	Sharepoint List events.
SecurityComplianceAlerts	40	Security and compliance alert signals.
ThreatIntelligenceUrl	41	Safe links time-of-block and block override events from Office 365 Advanced Threat Protection.
ThreatIntelligenceAtpContent	47	Phishing and malware events for files in SharePoint, OneDrive for Business, and Microsoft Teams from Office 365 Advanced Threat Protection.

Reference

Aspose.Email.Clients.Activity Namespace