It will help to know what you've tried so far. I would start with a BIOS reset to see if it works. You might have changed a setting that prevents it from working or disables it.
Assuming the Turbo Mode Function option is enabled in the BIOS (multiplier needs to be set to Auto or x21, otherwise the Turbo Mode option will be greyed out), post a pic. of CPU-Z open to the CPU tab while running either Prime or IBT.
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