Scenario:

From the Integrations -> Security Integrations menu, you've deployed the MSP Process app for Authenticator into your customer's M365 tenants, but you're seeing the following failure:

Solution:

1. Login to that client's Azure portal (https://portal.azure.com)
2. Navigate to the Enterprise Applications page
3. Search for the Azure Multi Factor Auth Client app - note that you'll need to remove the Application Type == Enterprise Applications filter:
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4. On the Properties tab of the app, ensure that the Enabled for users to sign-in option is enabled:
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5. Click the Save button at the top of the page

That's it! You can now try the deployment of the MSP Process app for Authenticator again.