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Workflow encounters an error when sending a meeting request

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This article was created in response to a support issue logged with K2. The content may include typographical errors and may be revised at any time without notice. This article is not considered official documentation for K2 software and is provided "as is" with no warranties.
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This article has been archived, and/or refers to legacy products, components or features. The content in this article is offered "as is" and will no longer be updated. Archived content is provided for reference purposes only. This content does not infer that the product, component or feature is supported, or that the product, component or feature will continue to function as described herein.

Issue

You may encounter an error when sending a meeting request from an Exchange Event:

Exception has been thrown by the target of an invocation. Please make sure the K2 service account has impersonation rights in Exchange. The account does not have permission to impersonate the requested user.

Symptoms

The K2 service account is able to access the EWS URL:  (https://outlook.office365.com/EWS/Exchange.asmx) from the K2 server.

Troubleshooting Steps

In the Office 365 Admin Portal, please create the ApplicationImpersonation admin role if it does not exist and add the Exchange Online account as a member of the role.