I got the same message. I have been in financial world a long time and new that the IRS wouldn't leave a message, and then they would send something in the mail not just make a phone call. Looked up online and saw these messages. SCAM....don't answer! THey just want access to your phone somehow.
This is 100 percent phishing scam. The IRS is in Andover MA not Seattle WA. They would not file a law suit they would work with you. Also why a pre recored message. Lol these scammers must think people are stupid.