Unable to associate due to failure in acquiring purchase from the app store. Please try again.
In most cases, this issue occurs when Microsoft Office is not able to find a purchase associated with your Apple ID.
To resolve the issue:
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Check your Apple subscriptions page to verify whether your Microsoft 365 subscription is active.
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If your Microsoft 365 subscription is active, try the steps in this article: Restore previous purchase for Office for Mac.
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If your Microsoft 365 subscription has expired, renew your subscription.
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If the problem persists or if you think you should not be seeing this error, please contact Microsoft Support.