Einstein Activity Capture (EAC): Calendar Events Not Syncing — Reassign Missing Permission Sets on Platform Integration User

This article answers the question: why are calendar events not syncing to Salesforce with Einstein Activity Capture (EAC), and how do you fix it? If EAC events are not syncing, the most common cause is that one or both required permission sets have been removed from the Platform Integration User. The steps below walk through how to identify the Platform Integration User, verify which permission sets are missing, and reassign them using SOQL and Anonymous Apex.

Note: The Platform Integration User is a special system user that is not visible in Setup → Users for most admins. Use the SOQL and Apex workaround below to identify and fix the permission set assignment directly.

Step 1: Identify the Platform Integration User via SOQL

Run the following query in Developer Console → Query Editor or Workbench to find the Platform Integration User's ID:

SELECT Id, Name, Profile.Name, IsActive FROM User WHERE Name = 'Platform Integration User' LIMIT 1

This query returns the Platform Integration User's Salesforce ID, which is a 15 or 18-character string starting with 005.

Step 2: Verify Which Permission Sets Are Currently Assigned

Run this query to check what is currently assigned to the Platform Integration User:

SELECT Id, PermissionSet.Name, PermissionSet.Label, Assignee.Name
FROM PermissionSetAssignment
WHERE Assignee.Name = 'Platform Integration User'

Confirm whether Einstein Activity Capture Sync C2C Integration User and sfdc.activityplatform are present. If either is missing, proceed to Step 3.

Step 3: Identify the Missing Permission Set ID

Run the following query to get the ID of the missing permission set:

SELECT Id, Name, Label
FROM PermissionSet
WHERE Name = 'EinsteinActivityCaptureC2CIntegrationUser'
LIMIT 1

For sfdc.activityplatform, run this query:

SELECT Id, Name, Label
FROM PermissionSet
WHERE Label LIKE '%activityplatform%'
LIMIT 1

Step 4: Assign the Missing Permission Set via Anonymous Apex

Open Developer Console → Debug → Open Execute Anonymous Window and run the following Apex code. The code finds the Platform Integration User, finds the missing permission set, and inserts a permission set assignment that links the two.

// Step 1: Get the Platform Integration User
User piu = [SELECT Id FROM User WHERE Name = 'Platform Integration User' LIMIT 1];

// Step 2: Get the missing permission set
// Replace 'EinsteinActivityCaptureC2CIntegrationUser' with the correct API name from Step 3
PermissionSet ps = [SELECT Id FROM PermissionSet 
                    WHERE Name = 'EinsteinActivityCaptureC2CIntegrationUser' LIMIT 1];

// Step 3: Insert the assignment
insert new PermissionSetAssignment(AssigneeId = piu.Id, PermissionSetId = ps.Id);

System.debug('Permission set assigned successfully to: ' + piu.Id);

Repeat for sfdc.activityplatform if that permission set is also missing.

Note: If EAC is not correctly set up in your org, these permission sets might not be present, and you will get the following error:

System.QueryException: List has no rows for assignment to SObject

Step 5: Verify the Assignment Was Successful

Re-run the verification query from Step 2 to confirm both permission sets now appear:

SELECT Id, PermissionSet.Name, PermissionSet.Label, Assignee.Name
FROM PermissionSetAssignment
WHERE Assignee.Name = 'Platform Integration User'

Step 6: Validate That Calendar Events Sync

Create a test event in Outlook or Google Calendar and confirm it syncs to Salesforce within a few minutes. If events still do not sync, ask affected users to disconnect and reconnect their email and calendar account. This refreshes service tokens and bindings.