Fan Speed not changing

I have a 4 pin fan (https://www.amazon.com/dp/B09CT7FTV6?ref_=ppx_hzsearch_conn_dt_b_fed_asin_title_3&th=1) hooked up to the EMC2101, but when I run the test program, I'm getting the same fan speed each time, and it's a fan speed that according to the spec is way faster than it should be able to run.

I assume that I have something incorrectly wired, but I'm not sure what to check...

Thoughts?

Test program results:

`Setting fan speed to 25%
Fan speed @ 25: 234782.61
Setting fan speed to 50%
Fan speed @ 50: 234782.61
Setting fan speed to 75%
Fan speed @ 75: 234782.61
Setting fan speed to 100%
Fan speed @ 100: 234782.61`

(fan is spec'ced for a max speed of 4500 RPM per the amazon spec page.)

Start with the test program mentioned in the report and review the EMC2101 and four-pin fan wiring. Reproduce the 25%, 50%, 75%, and 100% settings while checking how the reported 234782.61 value is obtained. Done means the cause of the unchanged, implausible speed reading is identified and the readings respond plausibly to the settings.

Written by the indexing model from the issue text.