I have a panasonic phone system at my business I just purchased. Former owner lost password how do I reset?

The voice mail is a panasonic module that is attached, the reset button on the buzz system doesn’t reset the voicemail. I want to change the salutation but I am locked out!
The voice mail is a panasonic module TVS50 that is attached, the reset button on the buzz system doesn’t reset the voicemail. I want to change the salutation but I am locked out!

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