At the moment, Wallet does not support sending BTC to native segwit addresses starting in bc1. 

There are 2 types of segwit addresses. Native segwit (address starts with bc1) and non-native (address starts with 3). 

We support non-native since it is similar to P2SH (same as multisig so addresses looks the same); however, we do not support bc1 in the Wallet.

Please generate an address that starts with 3 or see if you can generate a legacy btc address.

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