Maybe it's the hardware revision or firmware of the I-225V. There's 3 hardware stepping B1, B2 and B3. B1 had a number of issues, B2 had some as well but they were addressed with a nvm firmware update to 1.45. Some early Z490 boards shipped with B1 and later boards B2, then even later the B2 boards were factory flashed with 1.45. B3 is found in mostly Z590 boards.
So far everyone that's posted success screenshots has been on revision 0x0002 or 0x0003 (in one of the vision Z590 build threads.) I wonder if those who don't have it working either have revision 0x0001 chips or firmware versions lower than 1.45