Hello,
Does your BIOS look like the manual which shows 2 places for you to change the XMP setting,
- Advanced Frequency Settings
- Advanced Memory Settings
If you haven't used the Advanced Memory Settings section, try that instead.
Or check both, on the newer boards the Advanced section overrides the Frequency settings.
Also, when you choose a profile in the BIOS, does it have profile 1 / profile 2 and show 2133Mhz?