Thanks! I eventually fixed the problem by downloading the sample app and comparing the code to mine. I found out I was replacing the configuration values (e.g. Auth0:Domain) with the actual values from my profile. Silly me! Also, I didn’t include the application keys into my appsettings.json file. I’m not sure it was mentioned in the tutorial, maybe it was considered obvious, but then again, I’m a total noob at this. 
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