how to remove google ads conversion action that cannot be removed because it is used for optimization at the campaign-level

I am trying to integrate firebase into google ads account to track installation conversions from the app , i unknowingly used the first_open (ios) for the staging app while i need it on production app , i can't import the one for the production since they are both considered the same conversion action

 You've imported 0 app conversion actions from Google Analytics (GA4)     Important next steps:  warning     The following Firebase event(s) couldn't be imported,     because you already have conversion action(s)      tracking the same conversion event for     the same app: (iOS) First open 

, and can't remove the one already exists , it fails with this error message :

This conversion action cannot be removed because it is used for optimization at the campaign-level. 

also when trying to Change conversions setting it says :

Cannot edit campaign conversions setting for a UAC campaign. 

any idea or suggestion would be great