SPFx webpart doesn't work after deploy

Mccartc11025 did you supply the web part context to PnP JS library while using it within SPFx? 

Example: 

import pnp from "sp-pnp-js";

// ...

public onInit(): Promise<void> {

  return super.onInit().then(_ => {

    pnp.setup({
      spfxContext: this.context
    });
    
  });
}

Above code might differ based on the version of PnP JS you are using. Check below threads for more details: 

1. Using @pnp/sp setup  
2. Web-Part works on localhost, but it does not working on SPO 

Also, make sure you are using --ship while bundling and packaging the solution, like: 

gulp bundle --ship
gulp package-solution --ship

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