I am using Postman for some time now and it always worked. It seems that something has changed as I can directly authorize through OAuth and immediately after it all subsequent requests fail:
"Session expired or invalid"
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Okay - I already found the answer. It seems there's now a (new?) option in Postman that needs to be turned on:
Credits for this go to Ayisha Begum and the answer here: https://developer.salesforce.com/forums/?id=906F000000099xAIAQ