Where can i find my OSA key

1. Sign in your Volume Licensing Service Center, if you do not have the account, please sign up now.
https://www.microsoft.com/licensing/servicecenter/default.aspx

2. Please make sure you already add the license to your account, you can click Licenses > Relationship Summary > then click Add Open License to add the license

3. Click Online Service Activation, select the License ID and click Manage Activations 

4. click Sign-in with xxxxxxx.xxx << Your domain

5. You can find your OSA key and you can click "Start Activation" to activate your product, or try redeem instruction.

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If you got any problem for Microsoft Volume Licensing, you can contact Microsoft Volume Licensing Support