Cannot kill running process - node.js

Question

I have a TypeScript Express application inside an Ubuntu 20.x server and I just did a code update and when I attempt to run a node build/app.js, I get the following error:
> > node build/app.js
>
> node:events:498
> throw er; // Unhandled 'error' event
> ^
>
> Error: listen EADDRINUSE: address already in use :::8080
> at Server.setupListenHandle [as _listen2] (node:net:1330:16)
> at listenInCluster (node:net:1378:12)
> at Server.listen (node:net:1465:7)
> at Function.listen (/home/ubuntu/wmui/service-integration/node_modules/express/lib/application.js:618:24)
> at Object.<anonymous> (/home/ubuntu/wmui/service-integration/build/app.js:70:5)
> at Module._compile (node:internal/modules/cjs/loader:1103:14)
> at Object.Module._extensions..js (node:internal/modules/cjs/loader:1155:10)
> at Module.load (node:internal/modules/cjs/loader:981:32)
> at Function.Module._load (node:internal/modules/cjs/loader:822:12)
> at Function.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:77:12) Emitted 'error' event on Server
> instance at:
> at emitErrorNT (node:net:1357:8)
> at processTicksAndRejections (node:internal/process/task_queues:83:21) { code: 'EADDRINUSE',
> errno: -98, syscall: 'listen', address: '::', port: 8080 }
I run sudo lsof -i :8080 and then get the pid and then run kill -9 <PID>, but that does absolutely nothing.
What next?
I have also tried this command: kill $(lsof -t -i:8080) and this command: kill -9 $(lsof -t -i:8080)
When I run another lsof -i:8080 I no longer see it listening to 8080, it just says:
node\x20/ 82822 user 21u IPv6 123456 0t0 TCP *:http-alt(LISTEN)