Bad Origin error when attempting a simple transaction

I am experiencing a weird problem when I try and send some DOT.

I tried 4 times to send 0.1DOT and the transaction always fails with a generic “Bad Origin” error.

See https://polkascan.io/polkadot/transaction/0x668310b0ed4ebbbe982fca524baa949f835deaee6794a50f533c9d34423e4c8f as an example. Is there anything I am doing wrong?

Seems like DOT are not transferrable before the new denomination or some sort of referendum. See https://www.reddit.com/r/dot/comments/i2k6z8/transfers_incorrect_account_type/