Youtube ApiKey Invalid Credentials
<p>I have create an Youtube v3 API key. I have 2 application, in one application it is working. In another I am getting "401 Invalid credential". I tried with 2 different keys and also tried 2 different project with 2 different keys. Still same problem.</p>

<p>I remember when I created an Api Key, I have verify. For second want to do same, but forgot how I did for 1st one.</p>

<p>Can please help me. Thanks in advance.</p>