INVALID_OAUTHTOKEN using Self Client Access Token (Android)

INVALID_OAUTHTOKEN using Self Client Access Token (Android)

Hi,  

I using the Zoho Android Demo app to try to evaluate Zoho Assist.  https://github.com/zoho/Assist-Customer-Android-SDK-Demo

I am successfully able to get an access token by POSTing the generated code from Self Client via POSTMAN.
scope = ZohoAssist.sessionapi.ALL

{
"access_token": "1009962",
"refresh_token": "10068c6efc5",
"scope": "ZohoAssist.sessionapi.ALL",
"api_domain": "https://www.zohoapis.com",
"token_type": "Bearer",
"expires_in": 3600
}


I use the access token along with the session id in demo application but it is returning a 400 response INVALID_OAUTHTOKEN.

Any idea why this would be happening?  I confirmed that the correct access token is being used in onSessionStart.

I am aware the token expires after an hour. 

Thanks


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