how to create email alias at @bugcrowdninja?

I am new to bug bounty hunting and i wanted to test for Authorization vulnerability but the target wants me to sign-in with @bugcrowd ninja alias, in this case i will have one email account for user A

What should I do for the userB?

I want to know how you guys do this.

submitted by /u/izanawistaria
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from hacking: security in practice https://ift.tt/3dCowta