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You plugged in a "bad" setting. You should have used (underscore) trusted_hosts not (dash) trusted-hosts.
Support may need to help you fix this, but if you're brave (and have backups), you could open the workgroup.yml file generally found in C:\ProgramData\Tableau\Tableau Server\data\tabsvc\config\workgroup.yml, find the "bad" setting and remove it from the file. Delete the whole line, not just the text (you don't want to leave a blank space, in other words)
We generally don't want you in this file yourself, as one false move can blow up the server...but since that problem already exists, no real harm done, right?
It wasn't quite where you said. I actually had to modify C:\ProgramData\Tableau\Tableau Server\config\tabsvc.yml which is where the bad value had been stuck.
It was pasted onto the end of a long single line of configuration parameters. Apparently, that's what Tableau Server does when it doesn't know where a value belongs. Anyway, it was colon-delimited, so I was able to parse out where the "bad" value started and ended and then fix the server.
Thanks a ton for your helpful direction! I hadn't looked in ProgramData yet, and that was really the key to finding my answer.