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Are you sure you're using your private OWNER key ? Seems like the wrong key type

@ausbitbank yes using private owner key @steempeak , returns that message.

Also at steemworld.org it forces me to use steemconnect for entering the OWNER key for security reasons, but then it fails to create the transaction.

I'm pretty paranoid at this point, could it be that the TRON witnesses are denying this type of transaction?

Same experience here, but got "38" instead of "149".
I tried it with two different accounts.

In the meanwhile it worked here, too!

I can not reproduce this. For me everything works well