I think you need to tag without the "v" in order for Xcode's version of SPM to pick up the package

[jackpal]

I think it's a known limitation/bug of Xcode's integration with Swift Package Manager that the version numbers have to be pure semantic version numbers, like "3.5.1" without any prefix.

In order to use your package with Xcode 14.3 beta, I had to fork it and add a tag of 3.5.1