For many users this has worked, for me, it did not. As you can see in the image below, vCenter does not have the vSphere Data Protection.
In order to resolve this problem I accessed https://<vCenterIPAddress>/mob. From there log in with your Administrator account, whatever that might be. From there you will need to select “content”.
After selecting that, you will be presented with a bunch of properties. Scroll down and select “ExtensionManager”
From there you will be presented with another screen that will show you all of your extensions and provide some methods at the bottom. Verify that extensionList[“com.vmware.vdp”] is listed. You will need to select “UnregisterExtension”.
After selecting “UnregisterExtension” a popup willbe presented. Enter “com.vmware.vdp” without the quotes and select “InvokeMethod”.
Once this has completed, you will notice that extensionList[“com.vmware.vdp”] is no longer listed.
After all the steps above have been completed, reboot your vDP VM by right clicking on the virtual machine and selecting “Restart Guest OS”. Once it reboots, log out of the vCenter Web Client and log back in using your credentials. This should present vSphere Data Protection extension in your vCenter.
Hopefully this will help someone because it ate up a good portion of my time.