Microsoft has plans to stop supporting password-based authentication to Exchange Online during the second half of 2021. OAuth will be required. For more information, see Exchange Online: Basic authentication and modern authentication.
Riva Cloud is ready. Even right now, you can convert an existing Exchange Online connection to an Office 365 OAuth connection.
To convert an Exchange Online connection to use modern authentication (OAuth):
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Log in to the Riva Cloud Dashboard and select the Synchronization drop-down from the left side panel. Then, select the Connections tab.
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From the Connections view, select the Exchange Online connection you wish to edit by clicking the overflow menu in the top-right corner of the connection and then selecting Edit.
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On the Exchange Connection page, select Switch to Modern Authentication.
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Sign in to your Riva-related Microsoft account.
Result: From now on, Riva Cloud will use an OAuth connection to Office 365 instead of a password-based connection to Exchange Online.