The password credentials - either web or voicemail - conflict with the rules in the Authentication Rule(s) applied at the Subscriber Template and/or individual user level.  If you have the "Check for trivial passwords" flag checked then your password cannot be generic strings like 123456 or passwords with repeating characters such as 112233 or even aabbccdd - they are considered easy to hack.  Either assign new initial passwords or change the Authentication Rules and I suspect your issue will go away.

Hailey

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