@maciej-wisniowski thanks for replying. I checked and seems [singleCase]user.password already there in my custom theme.
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RE: Error after updating the password
@joshua Unfortunately, I have similar issue while updating the password through Self Service Portal. It displays 500 Internal Server Error only if new password is not as per application specific password validation rules/constraints. It works fine if updated as per validation rules. As per correct flow , it should display field errors for validations instead redirecting to 500 Internal Server Error.
For reference, logs are