V20 unable to review old messages in mailbox

STI-David

Gold Partner
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V20 hosted by 3CX

When client wants to listen to the 17 old messages in his mailbox, he gets up to the 10th message, on the 11th the system says "Invalid PIN number".

I did a reboot of the OS, no change.
Is this a bug?
 
Anyone experience this issue?
 
Any suggestions would be appreciated.
 

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