Cannot deploy new v4 strapi project to Heroku or Render - getting "401 Unauthorized" error on fontawesome request

I just ran into this issue and followed the steps from @kero but I’m still getting an error when trying to deploy in Render. I’m assuming font awesome was indeed the culprit because I did have an auth token for font awesome previously set in my .npmrc. However, after removing the file, I’m still getting 401 from Render.

npm ERR! code E401
Sep 30 01:21:02 PM  npm ERR! Incorrect or missing password.
Sep 30 01:21:02 PM  npm ERR! If you were trying to login, change your password, create an
Sep 30 01:21:02 PM  npm ERR! authentication token or enable two-factor authentication then
Sep 30 01:21:02 PM  npm ERR! that means you likely typed your password in incorrectly.
Sep 30 01:21:02 PM  npm ERR! Please try again, or recover your password at:
Sep 30 01:21:02 PM  npm ERR!     https://www.npmjs.com/forgot
Sep 30 01:21:02 PM  npm ERR!
Sep 30 01:21:02 PM  npm ERR! If you were doing some other operation then your saved credentials are
Sep 30 01:21:02 PM  npm ERR! probably out of date. To correct this please try logging in again with:
Sep 30 01:21:02 PM  npm ERR!     npm login
Sep 30 01:21:02 PM  
Sep 30 01:21:02 PM  npm ERR! A complete log of this run can be found in:
Sep 30 01:21:02 PM  npm ERR!     /opt/render/.cache/_logs/2022-09-30T20_21_02_068Z-debug.log
Sep 30 01:21:02 PM  ==> Build failed 😞

Any other ideas or solutions to this?

Thanks!