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Based on my research, unchecking "LinkedIn contact sync" in the Exchange Admin Center (OWA policies) will not remove the LinkedIn tab. The tab will remain visible in the Classic Outlook desktop client, the New Outlook for Windows, and OWA.
The setting you referenced (Path: Exchange Admin Center -> Roles -> OWA policies -> LinkedIn contact sync) only controls contact synchronization. Disabling it prevents users from saving/syncing their LinkedIn connections into their personal Exchange Contacts folder. It does not hide the live "LinkedIn" tab that appears on a user's Microsoft 365 Profile Card.
To remove the LinkedIn tab globally across all platforms, you should disable the integration at the organizational (tenant) level (Via the Microsoft Entra admin center).
- Log in to the Microsoft Entra admin center.
- Navigate to Identity > Users > User settings.
- Under the LinkedIn account connections section, set the toggle to No.
- Click Save.
It may take 24 hours for this tenant-level change to fully propagate and remove the LinkedIn tab from the profile cards across all of your users' Outlook clients.
For more details on how the Profile Card and LinkedIn integration is managed, please refer to the official Microsoft documentation: Integrate LinkedIn account connections in Microsoft Entra ID
In addition, I found a topic that addresses your concern. You can refer to it here: How to Disable LinkedIn Integration in Microsoft 365
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I hope this information helps.
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