AWS Amplify React - Deployment and Authentication No Longer Working - reactjs

Question

I have a React application that I deployed to AWS Amplify which has been working just fine. I deployed the application in September of this year, and decided to make a minor HTML update yesterday. I tried to re-deploy the application but I am facing two issues: (1) First, I keep getting an error in the deployment process. You can see the end of the log of the error below:
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2022-12-23T12:45:48.274Z [INFO]: npm ERR! code 127
2022-12-23T12:45:48.277Z [INFO]: npm ERR! path
/root/.nvm/versions/node/v16.19.0/lib/node_modules/#aws-amplify/cli/node_modules/babel-runtime/node_modules/core-js
npm ERR! command failed
npm ERR! command sh -c -- node -e "try{require('./postinstall')}catch(e){}"
npm ERR! sh: node: command not found
2022-12-23T12:45:48.277Z [INFO]: npm ERR! A complete log of this run can be found in:
npm ERR! /root/.npm/_logs/2022-12-23T12_42_58_395Z-debug-0.log
2022-12-23T12:45:48.340Z [WARNING]: Process exited with exit code: 127
2022-12-23T12:45:48.340Z [INFO]: ! Error patching NPM package '#aws-amplify/cli' to version 7.6.19
2022-12-23T12:45:48.346Z [INFO]: # Retrieving cache...
2022-12-23T12:45:55.639Z [INFO]: # Extracting cache...
2022-12-23T12:46:05.281Z [INFO]: # Extraction completed
2022-12-23T12:46:05.469Z [INFO]: # Retrieved cache
2022-12-23T12:46:38.486Z [INFO]: ## Starting Backend Build
# Starting phase: build
## Running amplify pull to generate aws-exports.js file for frontend
2022-12-23T12:46:43.354Z [INFO]: [31mInvalid feature flag configuration[39m
2022-12-23T12:46:43.356Z [INFO]: [31mThese feature flags are defined in the "amplify/cli.json" configuration file and are unknown to the currently running Amplify CLI:[39m
[31m - graphqltransformer.showfieldauthnotification[39m
[31mThis issue likely happens when the project has been pushed with a newer version of Amplify CLI, try updating to a newer version.[39m
[31mEnsure that the CI/CD pipeline is not using an older or pinned down version of Amplify CLI.[39m
[31mLearn more about feature flags: https://docs.amplify.aws/cli/reference/feature-flags[39m
2022-12-23T12:46:43.373Z [ERROR]: !!! Build failed
2022-12-23T12:46:43.373Z [ERROR]: !!! Non-Zero Exit Code detected
2022-12-23T12:46:43.373Z [INFO]: # Starting environment caching...
2022-12-23T12:46:43.374Z [INFO]: # Uploading environment cache artifact...
2022-12-23T12:46:43.486Z [INFO]: # Uploaded environment cache artifact
2022-12-23T12:46:43.487Z [INFO]: # Environment caching completed
Terminating logging...
...I tried to (1) delete node_modules, and run npm install again, but that was not successful. I noticed that the most recent aws-amplify/cli is a higher version than the one I am using, but I set the 7.6.19 version in the Build parameters in AWS, so I can't imagine that this is the issue. I upgraded the local cli to the current version, but that did not make a difference either.
The (2) second issue I am facing is that user authentication is no longer working when I run the application locally on my machine. I even reverted back to the commit that was working, and even that is not able to allow users to login. Keep in mind the version in production is just fine (and its the same version as the commit I tried locally).
My question is: What do these errors have in common, and can you suggest a path forward to address this?