Why isn't my API access token functioning correctly?

Shopify Partner
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Hello everyone, so my supervisor has created a development store for me, to test the REST api endpoints. After that I have added products in that store, and then created an app, to get the necessary api credentials to test api endpoints and api requests. But unfortunately my api access token isn't working. I have created a new app as well to make it work with the new access toke. But getting the same error in Postman:

"errors": "[API] Invalid API key or access token (unrecognized login or wrong password)"
Any help would be greatly appreciated. I am not sure what might be the reason? Is it possible that since I didn't create the store it's not working? Cause what can possibly be the reason. 
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