The XRP Ledger has a base reserve requirement of 20XRP for each address on the ledger.  The base reserve cannot be used to send funds to another XRP address.  This amount stays in your XRP address and is implemented to prevent the malicious usage of the network.

Your XRP transaction can fail for the following reasons:

1. If the very first transaction you are receiving in your BRD app's XRP wallet is less than 20XRP;
2. The wallet you are sending funds to has not been activated with the base reserve, and you are sending less than 20XRP to it;
3. You are making a transaction that will leave less than 20XRP in your wallet