Access token not working

Access token not working

So I'm implementing the zoho desk api in a self client using python and the requests module. This far, i've been able to create my access tokens, but they don't seem to work. The way I made it working is :
i set in different variables my client_id and my client_secret, I setup the authorization code via the developer portal to give the proper permissions and then I call them by doing :"",data={
At this point, when I print the response it gives a correct access token.
The problem is, when I get this access token and I use it by example to list all tickets, the response it gives me is <Response [400]>, with no further details provided.
My question is, what am I doing wrong and how can I fix it ?
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