It all depends on your sending wallet and their receiving wallet. If someone is using ZeusPay or Alby hub and their wallet is offline when you try to send, then you’ll have to wait until they open Zeus to claim it, or in the case of an offline Alby hub the payment will just fail. Other causes of failure could be poor outgoing liquidity/connectivity from your sending wallet, or on their receiving end. Also some wallet providers like ZBD block payments from IP addresses in certain regions because they’re not legally allowed to operate in those regions. 

 Ooohhhh, that makes a lot of sense!! Glad to know it’s not me at all, awesome! Thanks so much!!!