3262822 - Error - Unable to parse oauth token response due to Unexpected character ('<' (code 60))

When using OAuth from some Third Party vendors, you face issue "Unable to parse oauth token response due to Unexpected character ('<' (code 60)): expected a valid value (JSON String, Number, Array, Object or token 'null', 'true' or 'false') at [Source: (StringReader); line: 3, column: 2]; click to download server response"

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SuccessFactors HCM Suite

oauth, third party, microsoft oauth server, security center, integration center, ic , KBA , LOD-SF-INT-ODATA-OAU , ODATA OAUTH Authentication , Product Enhancement