I have a RØDE NT1 microphone. I want to sing live on TikTok. I had a Go XL Mini mixer with an adapter and an AUX cable.

I have a RØDE NT1 microphone. I want to sing live on TikTok. I had a Go XL Mini mixer with a sound card adapter and aux cable. Nobody could hear me, nor could I hear any music. Is this a problem with the phone or the PC? Because with Windows, you have to configure a few things and download the Go XL app. I'm completely clueless when it comes to technology. Can anyone help me?