NUCLEO-H7S3L8 HSE times out

[qua]

I am trying to set up a basic USB project on a NUCLEO-H7S3L8. It works okay with the HSI, but I need the HSE. I can see that the board has a 24MHz crystal fitted and resistors on SB14 and SB15. It's unmodified from the factory.

HAL_RCC_OscConfig() always returns with a timeout when trying to activate the HSE. I've tried various settings but can't get it to work.

I have attached my .ico file. The code is just what CubeMX generates. Thanks.

[AScha.3]

Did you set it like this ?

+ in clock tree set the 24M

It should work then. (My H7S3 does.)

[qua]

Looks like it is set correctly.

[AScha.3]

Did you set it like this ?

... and USB:

[qua]