Calendly is a 3rd party app that is not approved for integration with McMaster M365 apps due to privacy, security, and support concerns.

The following canned answer is available in Jira Service desk when answering tickets where the customer is requesting Calendly app:

Hello,

Unfortunately, Calendly is currently one of the 3rd party apps that is not approved for integration with McMaster M365 apps due to privacy, security, and support concerns.  A list of approved apps can be found here Microsoft 365 and Zoom Third Party Apps and Integrations (sharepoint.com)

As an alternative, you can make use of Microsoft Bookings, which is a comparable application and similar to Calendly but is included with our existing Microsoft apps. For more information on Bookings, please visit: https://office365.mcmaster.ca/office-365-3/applications/bookings/

Please let us know if you any have questions.

If the customer still has questions or issues after providing them with the canned answer above, please move the ticket to the Collaboration and Productivity team.

• https://mcmasteru365.sharepoint.com/sites/CSKB/SitePages/Request-for-3rd-party-add-on-for-MS-365-(need-admin-approval-to-install-error).aspx
• https://mcmasteru365.sharepoint.com/sites/CSKB/SitePages/MS-Bookings.aspx

MS Bookings

mcmasteru365.sharepoint.com
Customer is trying to install a 3rd party add-on and is receiving the following message in MS 365: