For those of you that find this article, since this issue still happens, here is what I did to fix the issue. First, this did not work: pod install --repo-update

It just kept generating the error: CocoaPods could not find compatible versions for pod "PurchaseHybridCommon"

I reinstalled CocoaPods, updated the dependencies, and still no luck. This simple fix worked. Reinstall RevenueCat plugin. It will install the correct version of the PurchaseHybridCommon pod:

npm uninstall @revenuecat/purchases-capacitor
npx cap sync
npm install @revenuecat/purchases-capacitor@latest
npx cap sync