I haven't had any luck powering the case fans or i/o interface, what could I be doing wrong?

did you supply power to the RGB hub in the back?

Questions & Answers: Antec Performance Series P20C ARGB, Massive Metal Mesh Front Panel, 3 x 120mm ARGB Fans & ARGB Hub, Type-C 3.2 Gen2 Ready, 2 x 360 mm Radiator Simultaneously, GPU Bracket, Mid-Tower E-ATX PC Case

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Item#: N82E16811129296
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Antec Performance Series P20C ARGB, Massive Metal Mesh Front Panel, 3 x 120mm ARGB Fans & ARGB Hub, Type-C 3.2 Gen2 Ready, 2 x 360 mm Radiator Simultaneously, GPU Bracket, Mid-Tower E-ATX PC Case

Massive Metal Mesh Front Panel
Three ARGB Fans & a ARGB Hub Included
Maximum Expansion Potential: 2 x 360mm can be installed in the front & on the top simultaneously.
TYPE-C 3.2 GEN 2 READY
Vertical GPU Installation Support
Supports Dual CPU Motherboard
8 x rubber grommets & 3 x cable ties included.
Removable GPU Holder Included
Back-Mounted PSU for Easy Installation
9 Fans Simultaneously

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