j"19HxigV4QyBv3tHpQVcUEQyq1pzZVdoAutLüDo you already have an account? And are you trying to log on with MB or relay?
If you answered no first, then yes, then thats the issue. You must register first: https://www.bitpost.app/register - then link the account to MB etc.
I know the UX sucks.
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BITCOIN_ECDSA"1P812avgcNLuTd3BMMyyAdP13bEkd4XWMyLXHxA9zUvwtdWbD7tKveQ2m1UxNvKSSS4rt3RYIOMSA2ZUDMahSs+gCMPIV9Z4znvOoFQUgfur78HGULPICn+Jv8g=
https://whatsonchain.com/tx/0485a4e3825cf6aa4a5bb0650fc39a4618e43fda45f7412a6ffc53fee2490b89