We are having trouble releasing the app. We are getting an error ' One or more forms for v347 contain V1 Mobile UCR references..'. However, we are not getting the setting to change the UCR version to Version 2.
If the setting to change the Mobile UCR version to V2 is not appearing then this most likely means that the app is already set to V2.
Looking at the error message it mentions that one or more forms in this app are still using Mobile UCR V1 references. These V1 references will need to be manually migrated to V2 before a new version of the app can be released. I recommend reading through the "Update Application Manual References" section in the linked migration guide. This includes examples on how to migrate V1 references to V2.