My Templates add-in doesn't work after installing Exchange Server March 2024 SU - Microsoft Support

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Applies To

Exchange Server 2019 Exchange Server 2016

Symptoms

After you install the Microsoft Exchange Server March 2024 security update (SU), the My Templates add-in in Outlook on the Web (OWA) can't be accessed.

When you try to start the My Templates add-in, you receive the following error message:

Add-in Error Something went wrong, and we couldn't start this add-in. Please try again later or contact your system administrator.

Resolution

To fix this issue, install the following update:

Hotfix update for Exchange Server 2019 and 2016: April 23, 2024 (KB5037224)

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