If you get this message "Ad account has no access to this Instagram account. Please use an authorized Instagram account or assign ad account to this Instagram account first" it means you need to assign your Instagram account to the ad account you want to run ads with. This error is categorized as a permission-related issue, commonly encountered in Meta Ads campaigns.
Here is how you do it:
Go to your Facebook Business Manager and log in.
Navigate to the 'Business Settings' section.
Under 'Accounts,' select 'Instagram Accounts.'
Click the 'Add Assets' button to link your Instagram account to your Ad Account.
Follow the prompts and select the ad account you want to link.
Confirm the addition of the Instagram account.
Once it's added, hard refresh the page on Smart Noise. If the Instagram account still doesn't show up, try logging out and back in your Facebook profile on Smart Noise.