[BUG] npm@10 refuses to install packages from GitHub package registry

Problem

Is there an existing issue for this? - [X] I have searched the existing issues This issue exists in the latest npm version - [X] I am using the latest npm Current Behavior npm@10 is not installing packages from a private GitHub Enterprise Server registry. It fails with a 403 forbidden error when trying to fetch the package. Previous versions of npm do not encounter this issue. Expected Behavior I should be able to install packages from a private registry when my `.npmrc` is configured properly. Steps To Reproduce Remove ~/.npm to ensure we're not pulling from cache [code block] Configure `.npmrc` to use a private registry (in this case, I am using GitHub Enterprise Server 3.9.3) [code block] Install a package from the private registry: [code block] Debug log: 2023-11-25T00_29_42_285Z-debug-0.log When using npm v9, this error does not occur. For example, with Node 18/npm 9: [code block] Using npm v10 with node 18 fails with the same 403. Use npm v9 with node 21 works. [code block] This seems to indicate that something has changed with npm 10 with how it handles private registries (or at least with GitHub's registry). Environment - npm: 10.2.4 - Node.js: 20, 21 - OS Name: Linux (RHEL 8) - npm config: [code block]