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Hi,

Thank you for reaching out. My name is Furkaan, a user just like you. I’d be happy to help you with your concerns. The document outlines troubleshooting steps for three different issues that can arise when using Teams and Exchange Server:

Issue 1: Teams delegate cannot schedule a meeting on behalf of a delegator

Verify the delegate has been granted Editor permission to the delegator's calendar. Verify the delegate has been granted "GrantSendOnBehalfTo" permission by the delegator. Ensure Teams isn't blocked from accessing EWS for the entire organisation. Issue 2: Teams Calendar App encountering issues

Verify the Teams Calendar App is enabled. Verify Teams upgrade Coexistence mode allows Teams meetings. Ensure Teams isn't blocked from accessing EWS for the entire organisation or the affected user. Verify the Microsoft Teams Calendar App test is successful. Issue 3: Teams presence stuck on Out of Office or not displaying 'In a meeting'

Verify the URL for the on-premises Exchange REST API has been published on the public network. Verify the Teams Presence Based on Calendar Events test is successful. Ensure Teams isn't blocked from accessing EWS for the entire organisation. The document also recommends verifying prerequisites to ensure compatibility between Microsoft Teams and Exchange Server. This includes Exchange Server version and environment, Exchange Autodiscover service functionality, and Exchange OAuth authentication.

For all three issues, common troubleshooting steps include verifying the Autodiscover service and Exchange OAuth authentication. Additionally, for all three issues, if Teams isn't blocked from accessing EWS for the entire organisation, it can be helpful to run a PowerShell command to check the EwsApplicationAccessPolicy parameter.

If you have any additional questions or concerns, please don’t hesitate to reach out. Give back to the Community. Help the next person who has this issue by indicating if this reply solved your problem. Click Yes or No below. Best Regards, Furkaan