If you're seeing the “Integration expired” status on Ads Manager, follow the steps below;
Check if you changed your App Store Connect password.
Revoke and reauthorize access from the Apple Search Ads account.
Ensure the campaign groups are not already integrated into another SearchAds.com by MobileAction account.
If the issue persists, feel free to contact your dedicated Customer Success Manager via your communication channels or the support team via Intercom.