[OS X TeX] problem with XITS Math

["M. Tamer Özsu"]

Hello,

I am trying to compile a file using 

I am getting the following error:
./test1.tex:7: Package fontspec Error: 
(fontspec)                The font "XITS Math" cannot be found; this may be
(fontspec)                but usually is not a fontspec bug. Either there is
(fontspec)                a typo in the font name/file, the font is not
(fontspec)                installed (correctly), or there is a bug in the
(fontspec)                underlying font loading engine (XeTeX/luaotfload).

If I force typesetting to continue, the output does not show the join symbol (as expected).

My environment is MacOS 15.1.1 and using TeXShop 5.48. My MWE is attached. Typesetting with XeLaTeX

I have confirmed that XITS Math is installed (when I try tlmgr install xits it tells me it is already there). I want to use XITS Math because I also use outerjoin symbols, etc and this should work well. 

Just as background, I was using \setmathfont{STIX Two Math} but that typesets \Join very large and in display environments, it typesets F in \Join_{F} underneath the join symbol rather than as a subscript, and I need the latter behaviour.

many thanks for any advice.

==Tamer

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