This seems to be just a good old bug within App Store Connect. I could not help myself other than creating a new subscription and adding it to the binary.
blueshifter
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I faced the same problem. The process of submitting a new binary together with a new subscription is confusing. You probably submitted the subscriptions seperate from your binary. They will approve the binary and, separately, check if they can purchase the subscriptions.
What you need to do is—when submitting a new binary—add the subscription to the binary on the app information page (where you can enter release notes etc.). This, however, is only possible for IAPs that are in status "Ready to submit" (others do not appear).
For me, I could not clear the status "Developer Action Needed" from the subscription. Indeed, I could slightly change the translations of the localizations of the subscription "Ready to submit" again. This, however, won't clear the "Developer Action Needed" flag from the subscription itself. This looks like a bug within App Store Connect to me. There is a YouTube video (https://www.youtube.com/watch?v=865YTXKl0-w) where the "Submit for Review" button is slammed. Even if that might work, it's not what you want at all.
The solution for me was to create a new subscription and do not click the "Submit for Review" button within the subscription (That would throw you down the rabbithole again). Instead add that new subscription to the binary. When submitting the binary, the new subscriptions will automatically switch to "Waiting for Review".
Related issue on the RevenueCat Forums: https://community.revenuecat.com/general-questions-7/developer-action-needed-on-subscription-1975?postid=10139#post10139
Related StackOverflow thread: https://stackoverflow.com/questions/6516301/how-to-change-status-developer-action-needed-in-in-app-purchase-feature
6 years later, this issue still exists. Adding a space (" ") re-enables the Save button. Afterwards, though, the Status "Developer Action Needed" is still there.
What about installing iOS 12 and 13 within XCode 15? For me, the lowest Version I can download from within XCode is 14 :(