Welcome, @JP.4, to the community!
The STM32H743VIH6 is in a TFBGA100 package, the only one where VREF is not led out. The datasheet says under Table 9, footnote 7:
VREF+ pin, and consequently the internal voltage reference, are not available on the TFBGA100 package. On this package, this pin is double-bonded to VDDA which can be connected to an external reference. The internal voltage reference buffer is not available and must be kept disabled.
So if you absolutely need VREF as an external pin, you will unfortunately have to switch to an STM32H743 in a different package.
Does it answer your question?
Regards
/Peter
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