update mac os mojave 10.14.6

Solved! at least for me.

The Key was

"The signed AP ticket could not be found" - # with "quotes"

https://forums.macrumors.com/threads/unable-to-do-incremental-macos-update.2183540/

My new MBP had a time-machine restore and it brought my old:

/etc/hosts

file which had this line at the end to fix some apple update issue from 2014

74.208.10.249 gs.apple.com

This broke the T2 chip contacting the apple server to verify ANY update. This error applies to any Mac with the T2 chip which needs an internet connection to update.

Finally! Thank you all for your help. The answer was out there, but I couldn't ask Uncle Google well enough.