I had to create a new local user on a domain member server with a password too simple for complexity requirement (complexity is enabled on active directory domain via GPO).
A temporary solution (until next GPO refresh) is this:
secedit /export /cfg C:\new.cfg
Edit new.cfg and change line “PasswordComplexity = 1” to “PasswordComplexity = 0”
secedit /configure /db %windir%\security\new.sdb /cfg C:\new.cfg /areas SECURITYPOLICY
You are now able to set a password that do not fulfill complexity requirement.