Can't change Admin password

Hello, i cant set a new admin password. I try this solution

VMware KB: Resetting the Administrator password in VMware vRealize Operations Manager appliance

And i have this error:

Call failed: Code 500 - HTTP Error 500: Internal Server Error

Response: {"error_message_key":"security.password_invalid","error_arguments":[]}

Original admin credentials restored from backup

I try many times wirh many types of passwords.

Any idea ?

Thanks