Receiving error AADSTS7000218: The request body must contain the following parameter: ‘client_assertion’ or ‘client_secret’

Problem: An application receives the following error when authenticating to Azure Active Directory: {     “error”: “invalid_client”,      “error_description”: “AADSTS7000218: The request body must contain the following parameter: ‘client_assertion’ or ‘client_secret’.\r\nTrace ID: xxx\r\nCorrelation ID: xxx\r\nTimestamp: 2019-08-18 20:38:28Z”,     “error_codes”: [7000218],     …} What does this error mean? The error is what it said.  When authenticating to Azure AD to get an access token, the client application is not providing…

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