What happens to your old ad account when you change your currency or time zone?

When you change your currency or time zone on an ad account within Facebook Ads Manager, the old ad account will be closed. This is because changing the currency or time zone fundamentally alters how the account operates and reports performance. Facebook's ad system requires one consistent currency and time zone to maintain accurate billing and reporting across all advertising activities. As such, creating a new ad account with the desired currency or time zone is necessary. Consequently, the existing account is closed to ensure that all ads operate under the same settings and avoid confusion in billing or ad management.

The other choices do not accurately represent the process, as the ad account does not remain active, merge, or experience a downgrade in ad tier simply due to changes in configuration settings.