Tried using the Indieweb compatible IW26 theme. Started getting array errors. Not sure why. There are too many moving parts going on right now to stop and try and diagnose the problem so I switched to the standard Twenty Sixteen theme.
Indieweb plugins installed. They are going to have to work with Twenty Sixteen theme or not. Indieweb capability would be nice but is not a priority for this site right now. Bugfix later. My original vision for this site includes comment form but no Indieweb. Added Indieweb because I can see synergies, but it is not vital for task.
Could have used SemPress theme which I like a lot, but already using it since 2018 on another site and need to have different appearance.