Adding Unity version in case that helps:
*• Windows version: 10
• Builder version: 3.70.3
• iOS SDK version: 17.5
• Unity version: 2022.3.55f1*
When you say "builder", you mean the Unity builder, not iOS builder, right?
Looking at documentation, it shows I can add the pod commands to the project's Podfile (I have no idea what that is). The other method is to "Drag and drop the Unity Ads framework into your workspace." I'm assuming that means the xCode workspace running on Mac. I don't build on Mac, so I'm not exactly sure.
Other suggestions I've found use Ruby, Gems, Homebrew to get CocoaPods installed, but those are all Mac related I believe. I was hoping to find a solution that would work for PC... that's why I like iOS Project Builder so much - No Mac required :)
I'm going to keep looking at forums to see if someone else has solved this on PC. I can't believe more people aren't having this same issue. It's not like I'm using Unity 2018 or something way out of date. Yes, 2022 is "old" but it's still LTS.