Having an issue activating mobile device under Exchange Activesync? Clear ActiveSyncAllowedDeviceIDs!

From time to time, as IT administrator, you had recalled a problem with an employee name, for our purposes, Ellen Ripley or if you prefer, xenomorph. The most recent “ah moment,” had derived from migrating an iPhone to a newer mobile device management product. Since this issue had come around twice over a half decade but, vexing enough to remember, figure worth mentioning.

The symptoms: Windows credentials won’t authenticate under Activesync but, testing against another active Exchange mailbox account, works fine.

Solution: Removing all Active sync devices from a user profile aka “Clear ActiveSyncAllowedDeviceIDs”

1. Launch Exchange Management Shell

2. Execute the following command example;

set-CASMailbox Ellen.Ripley -ActiveSyncAllowedDeviceIDs $null

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