The most common reason for an ad account to be put on hold is due to a billing issue or missing payment method. The ad account billing admin can usually remove the hold in these situations by adding or updating the credit card information in Campaign Manager.
If your LinkedIn Ads account has been put on hold, ads won’t run while the account is on hold but will resume once the hold is removed. A red banner will appear at the top of Campaign Manager with the reason why your account is On hold and the recommended steps to troubleshoot.