Unplugged my Sentry screener for 10 minutes while waiting for a recruiter to call. One of the three spam calls I received in that short window was from this bogus request to join a "conference call".

same here - just called me too - no message!

Have been called from the number above three times this past week.  Always tell me the government wants to give me $800.  (Now that's something new --government giving out money!)  The caller was asking me for the account number from my check.  That's when I made an excuse and hung-up.

You should download the app called Truecaller. It will tell you weather the call is a scam or not.  For this call,  over 200 people reported this as a scam.  I've heard that this caller will ask you to join a conference call and they with tell you how the government is willing to give you money.  For these kind of calls just say "No thank you" just to make sure you don't get yourself in trouble. Been through calls like this.

Called me too, what  a bunch of a**holes, do I answer let alone buy something from unknown callers. NO WAY!