XF 2.0 Guest Posts in Forums

Hi in our website, we have a particular forum where guest members are allowed to ask questions and answers.

Previously in VB they can type any name as username and post the Q/A.

But now the guest name is checking and showing alert message as
"User names must be unique. The specified user name is already in use. "

We need this to be changed either a Prefix name in Guest name / the name entered by user should be accepted without check with username database.

Is this is possible?
 
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