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Zander ZumbrunnenZander Zumbrunnen 

Lightning Sync no longer working

Hi all,

Starting today, our lightning sync has disconnected and I can not seem to find a solution to fix it that is not switching to Einstein Activity Capture.

We currently connect using to Outlook using OAuth 2.0. Everything says it is connected until you try to test connection where it says "We can’t connect with your email server using the email address you provided". 

When checking that status on my own connection I see this.
User-added image
I have tried googling around and found a few articles, but none have been that helpful.
Ex. 
https://help.salesforce.com/s/articleView?id=sf.exchange_sync_admin_status_msg.htm&type=5

https://help.salesforce.com/s/articleView?id=000351807&type=1

and
https://techcommunity.microsoft.com/t5/exchange-team-blog/basic-authentication-and-exchange-online-february-2021-update/ba-p/2111904

If we need to switch over to Einstein Activity Capture, we can try that, but I wanted to see if there is anything we can do to get the sync back up and running until then.

Any help would be much appreciated, thank you.
Zander ZumbrunnenZander Zumbrunnen

Update: I have ran the Microsoft Remote Connectivity Analyzer and failed on the "A new mail item is being created" test.
They provided a link to help resolve it which says "To resolve this issue, the Service Account must be granted permission to impersonate the specified user."
Does anyone know how to fix that test? I am guessing that is where the issue is. Again, no sync settings have changed and it was working perfectly in the past.