Forbidden error occurs when adding External Data on Vuforia Studio

• Forbidden error occurs when adding External Data on Vuforia Studio
• Not able to get ThingWorx entities list and data 
• The following error is in Studio.log

error: [twx-studio:auth:oauthHandler] Error making request for oauth config Error getting oauth config Error: Error getting oauth config
    at Request._callback (C:\Users\<username>\AppData\Roaming\VuforiaStudio\studio-download.vuforia.io\dist\server\auth\oauthHandler.js:132:21)
    at Request.self.callback (C:\Users\<username>\AppData\Roaming\VuforiaStudio\studio-download.vuforia.io\node_modules\request\request.js:185:22)
    at Request.emit (events.js:400:28)
    at Request.emit (domain.js:470:12)
    at Request.<anonymous> (C:\Users\<username>\AppData\Roaming\VuforiaStudio\studio-download.vuforia.io\node_modules\request\request.js:1154:10)
    at Request.emit (events.js:400:28)
    at Request.emit (domain.js:470:12)
    at IncomingMessage.<anonymous> (C:\Users\<username>\AppData\Roaming\VuforiaStudio\studio-download.vuforia.io\node_modules\request\request.js:1076:12)
    at Object.onceWrapper (events.js:519:28)
    at IncomingMessage.emit (events.js:412:35)
    at IncomingMessage.emit (domain.js:470:12)
    at endReadableNT (internal/streams/readable.js:1317:12)
    at processTicksAndRejections (internal/process/task_queues.js:82:21)
debug: [twx-studio:auth] Authorization strategy not yet known
[0mPOST /Thingworx/Resources/SearchFunctions/Services/SpotlightSearch [33m403[0m 544.513 ms - 0[0m

• The following 401 and 403 http response in Experience Service log

"GET /ExperienceService/username HTTP/1.1" 401 - "-" "-" 21 ms <VES URL> 
"POST /Thingworx/Resources/SearchFunctions/Services/SpotlightSearch HTTP/1.1" 403

• The user is able to log in ThingWorx and Vuforia Experience Service
• The user is able to validate the connection to Vuforia Experience Service from Vuforia Studio
• This error occurs even after log in as Administrator