@Sony @PierreN, are you using the destination tag of your XRP wallet?
If you e.g. use a ledger and you don’t have/need a destination tag, you can just enter 0000 - we will improve the UI to avoid this confusion in the future.
Also, please keep in mind, if you XRP wallet isn’t yet activated it will cost 10 XRP to activate it - that cost is coming from the XRP network, not from us.