OK, thanks for that.
Nothing at Dell says that the dock is compatible with any Mac product, that I could find. However, it *might* work, but only if the proper cables are used. Your Mac has TB4 (Thunderbolt 4) ports and will need TB4 certified cables to even begin to work with that dock. So, how are you connecting from the MBP to the Dock and from the Dock to the monitor?
NOTE: Not all USB-c cables are TB4 cables. TB4-certified cables have a lightning bolt on them and then a number "4" printed on the connector as well. If you aren't using a TB4 cable, that could well be the issue.