Getting invalid token on web api for dynamics

HI,
I am making the call organisationUri/api/data/v8.0/contacts GET request through postman -
Screen-Shot-2018-04-17-at-2.20.10-AM.pngScreen-Shot-2018-04-17-at-2.20.23-AM.pngGetting invalid auth token.
what could be the reason for that..
The authToken is not expired becasue i generated a fresh one.
Also i request authToken with the scope - Directory.Read.All Directory.AccessAsUser.All offline_access User.Read
could it be because of the scope that i am using .

Thanks
Rohit BajajAsked:
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Rikin ShahMicrosoft Dynamics CRM ConsultantCommented:
Have you created any application on Azure AD for this? Do you have a client id?

Check this post and answer given in it- https://community.dynamics.com/crm/f/117/t/193506
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Rohit BajajAuthor Commented:
yes I have created an application here - https://apps.dev.microsoft.com/#/application/552c9f85-508d-4a4a-8d59-c70308be31e6
I found this is the latest way probably to create an application...Other way is to directly go to azure and create the application.
Is there any difference between the two ??
I am getting accessToken... But i guess some problem with specifying scopes to read Leads data etc.
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Rikin ShahMicrosoft Dynamics CRM ConsultantCommented:
Which technology is used for the application? .net or JavaScript?

If you're using .net, you should have a client id to connect and authenticate your application. Check the link I posted earlier in the comment.
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Rohit BajajAuthor Commented:
I spotted something of my application on azure portal :
Screen-Shot-2018-04-17-at-5.25.52-PM.pngI think due to this I am unable to access crm data as the application does not have privelge to access data...
But I wanted to do this for testing purpose create an application and then access the data on the dynamics crm for the same user..
How do i do that...
I think for testing pupose azure should allow me as admin... Is there any way ??
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Rikin ShahMicrosoft Dynamics CRM ConsultantCommented:
Solution!
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