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I have an MSI B550 tomahawk max wifi motherboard and had a similar issue when I bought some fans.

Originally bought some fans that required the ARGB connector which I thought I had looking at the motherboard. It was a 4 pin JRGB but the plug would just not go in. Maybe it isn't supported? I think you have to check what voltage it is as well (I might be wrong).

So I ended up returning it and bought some fans that I had to connect to the psu that work great.