Comment 9 for bug 1697681

OK, great, I'm pretty sure that's it!

You can temporarily unset the environment variable on a console to test:
"set FONTCONFIG_FILE="
If you then run inkscape.com from that console I'm pretty sure your problem will be solved.

To delete the environment variable permanently see for example
https://www.techjunkie.com/environment-variables-windows-10/