On your MCU STM32H743VIT6, you have only 3 ADC Fast channels (as indicated on the last page of table 2 of the DS12110)

Those channels are ADC12_INP3 (mapped to the PA6), ADC12_INP4 (mapped to the PC4) and ADC12_INP5 (mapped to the PB1).
PS: ADC1 and ADC2 are tightly coupled and share some external channels (such as those that we have mentioned before). For the PF3, PF5, PF7, PF9, PF11 and PF13, they are also fast channels, but they don't exist on your MCU (as you can see on the Table9 of the DS12110) Your MCU Pin/ball name is LQFP100 or TFBGA100 (you can find the Pin/ball of your MCU on the Bottom of the Table 2 of the DS12110:(
Here is an example of the PF5 that output the fast channel ADC3_INP4, but it is not available on the LQFP100 or TFBGA100:

Best Regards.
STTwo-32
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