What all Application properties you are passing as part of body to the API endpoint ? "Display Name" is required property for the application object. Have you tried using only display name in body. I am able to create the application without any issues ?
Microsoft Graph API - Create Application [MethodNotAllowed]

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Hello,
I'm using the Graph Explorer (https://developer.microsoft.com/en-us/graph/graph-explorer) to try "create a new application". As-is with the POST request returns "MethodNotAllowed." Am I missing something?
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Saurabh Sharma 17,366 Reputation points Microsoft Employee
2020-06-11T00:04:17.593+00:00