Dear Justine Tarrant,
Thank you for the detailed reply and update.
So I'm hesitant to tinker with profiles in case it impacts Salesforce's performance again (it took a VERY long time to solve).
Is there another work around? I tried opting out as per these instructions: https://learn.microsoft.com/en-us/viva/insights/personal/use/add-in#to-opt-out
Based on your reply, I researched and also consulted with my team on this.
I kindly wanted to bring to your attention that we have a dedicated Outlook for Mac support team. This team can assist further on this scenario and can offer a more accurate work around after running diagnostics and also getting detailed logs for your current set up.
To contact Outlook for Mac: Contact support within Outlook for Mac (microsoft.com)
- Go to Help > Contact Support.

- Enter your Name, Email, issue that you are experiencing and select Send.

And when you get a message from support, you will be notified through the OSX notification center, and a notification message will be displayed on the status bar.
I appreciate your time and understanding.
Sincerely,
Anesu | Microsoft Community Moderator