Donald:
Acquire Font Book from Apple.
https://support.apple.com/guide/font-book/create-manage-font-collections-libraries-fb34860/mac
Open Font Book. Find the All Fonts icon at the top, left corner of the user interface. You can see it on the above specified web page highlighted in gray… Click on All Fonts and scroll down to TheSansBold. If this doesn’t work, try adding Helvetica as well. That will replicate a known working environment on my MacBook Pro running Mojave.
Richard