Trigger input jack not clicking in. WiiM Pro.

I used this to transition to 3.5mm mono.

Harmony IR Adapters, Ancable 2-Pack 2.5mm Mono Plug to 3.5mm Mono Jack Connector for Logitech Harmony Hub and IR Blaster, IR Emitter Extenders, IR Repeaters, IR Receivers https://a.co/d/9LHUp9A

If you're sure you have the correct size and configuration gently apply a little more pressure. Sometimes new equipment offers unexpected mechanical resistance.
 
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