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Hello @clixmoney I don't think it is asking for that. You have to use either your password or active key to login. Utopian uses SteemConnect. The same tool used by Busy.org and maintained by Steem

now it's saying that the key is wrong, I don't want to use my password, can I use the posting key ?

Maybe you are using the wrong active key. In your wallet - permissions, you must click on Login to show, on the right of the active key and use the one that shows up once you login or use your password. Utopian and Busy, they don't store your credentials.

I used both of them, the first posting key that is shown directly and the private one, no one is working

I am not sure @clixmoney then. @fabien do you have a suggestion what may be wrong here?