Try to set it in the advanced mode. F7, OC menu. Set the XMP enabled there then save and exit. If it can't training to 3200 it'll usually recover after a minute and give you a warning about a failed OC setting. If you set it to load XMP, it should load the XMP or fail. It's not like JEDEC where it has a list to work down until something works, you'll just get an overclock failure.
Sometimes instead of just auto xmp you just have to manually select the speed.
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