I have the hieroglyphic font, New Gardiner Medium, in .otf and .ttf
formats. It is installed in my OSFONTDIR and is accessible using other
applications.

But

\switchtobodyfont[newgardiner,14pt]𓇼𓋹

does not work (with either the .ttf or the .otf format).

I have checked: “NewGardiner” is the Postscript Name, the Full name, and
the Family Name.

So what have I missed?

Alan