http://or-in.facebookwkhpilnemxj7asaniu7vnjjbiltxjqhye3mhbshg7kx5tfyd.onion/business/help/374756690038600
Instead, find the post you want to advertise in page posts and use the post ID that appears in the ID column. Note: Some existing posts may not be compatible with your selected ad objective. If the post has an existing call to action with a different goal, you can’t use it to create an ad. For example, an existing post with the call to action "Shop now" can’t be used to create a call ad.