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Exchange 2019 - Mobile Access Settings Behavior for ActiveSync Devices

Step to IT 125 Reputation points
2025-04-17T20:00:11.69+00:00

After modifying the "Exchange ActiveSync access settings", new ActiveSync devices are receiving a "DeviceAccessStateReason" that differs from the previous state, such as "Individual" or "Policy". What steps are necessary to revert this behavior back to "Global"? Additionally, under what conditions does a "Policy" trigger an immediate "Blocked" status without sending "Quarantined Devices" for approval?

Exchange Server Management
Exchange Server Management
Exchange Server: A family of Microsoft client/server messaging and collaboration software.Management: The act or process of organizing, handling, directing or controlling something.
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  1. Step to IT 125 Reputation points
    2025-04-17T21:12:01.09+00:00

    Apparently, the main reason is the persistence of the "ActiveSyncAllowedDeviceIDs" and "ActiveSyncBlockedDeviceIDs" parameters. After deleting these parameters via the Set-CASMailbox cmdlet, everything is "Global" again.

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