Here is basically what you need to do:

git push -u origin [your_branch_name]

an example:

git push -u origin dev_WEB_2020.04_STK_RWS-17501-addMegaHoverForUnderlying

This gets it up to the remote.

Somewhere along the line, my .gitconfig file changed and set/reset the push default to something other than what it was.

[push]
    default = matching

This is what it should be:

[push]
    default = simple

The value it is set to, determines what git will do with the branches on your machine …