There are different issues on different platforms that make the device not register w/ the UnifiedPush Server.

On GCM some common issues are:

• no google account (SERVICE NOT AVAILABLE)
• incorrect URLs / credentials (from UPS)
• Incorrect SenderID

etc.

The document generated by this issue should give advice on how to gather data and debug it, when issues w/ the device registration process occur.

Basically we do need something like a trouble shooting document