when I was installing Oracle12c, I also encountered the problem that Oracle12c Failed to Create oracle oracle Home User. I also found many solutions on the Internet, and this one worked.

1, open domain security policy (secpol.msc) – security Settings – account policy – password policy – password must comply with complexity requirements. Define the policy setting to: disabled.

2. Finally, CMD runs refresh group policy command: gpupdate /force

3, reinstall.

4, solve.

blog from: https://blog.csdn.net/u010249920/article/details/80691814