Provisioning will fail unless a password is chosen that matches the complexity requirements. More details found [https://learn.microsoft.com/en-us/previous-versions/windows/it-pro/windows-server-2003/cc786468(v=ws.10)?redirectedfrom=MSDN here].
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For this purpose https://wiki.koozali.org/Random_Strong_Password_Generator can be used.
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WARNING: make sure to keep a copy of this password and not to modify this key after the domain is provisioned.