Apple Login Setup error

I was following the read me here and ran into a snag at step #10

Old Nick said:

Apple | Manual | XenForo ​

End-user documentation for XenForo

xenforo.com
Here for Apple, click on the links at the bottom of each page for the rest...
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On this read me it says to choose com.xenforo.community for the Bundle ID. But I get an error when I try and hit register.

An attribute in the provided entity has invalid value​

An App ID with Identifier 'com.xenforo.community' is not available...
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