Resolution - Step 2: Confirm that the mobile device isn't blocked by an ActiveSync quarantine rule Select Enable Exchange ActiveSync, select Yes when you're prompted, and then select Save.ДЄfter you re-enable ActiveSync, try to set up the device again. If you see Enable Exchange ActiveSync, this means that ActiveSync isn't enabled for the user.See Step 2: Confirm that the mobile device isn't blocked by an ActiveSync quarantine rule of this article. If you see Disable Exchange ActiveSync, this means that ActiveSync is enabled for the user.Under Mobile Devices, take the following actions: In the list of mailboxes, double-click the user, and then select mailbox features. In the left navigation pane, select recipients, and then select mailboxes. Select Admin, and then select Exchange to open the Exchange admin center. Sign in to the Microsoft 365 portal as an admin. Resolution - Step 1: Confirm that ActiveSync is enabled for the user The Exchange Online mailbox server that supports the connection isn't available because of maintenance or an outage issue.The device can't connect to the Internet service provider (ISP) or to the Internet.These include, but aren't limited to, the following: However, the mobile device previously could connect. A user's mobile device can't connect to Microsoft Exchange Online in Microsoft 365 through Microsoft Exchange ActiveSync.

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