If you have your connectors connected right to the MB, try checking in the BIOS/UEFI configurations and see if you can manually set them there.
https://www.howtogeek.com/275339/how-to-auto-control-your-pcs-fans-for-cool-quiet-operation/ (if you have a 3 prong to a 4 sided connector or vise versa)
https://www.ekwb.com/blog/what-is-pwm-and-how-does-it-work/
some links to help you