We tried to reconfirm ownership of your old site ( www.com ) and failed. Make sure your verification token is present, and try again. Got this error and the solution I found was to add the non www version of the site to the webmaster tool. Verify through google analytics method and then try again. That seemed to have fixed the error. I assume it can also work in reverse with the www or non. Good luck. Just another google glitch.
may also work if you use this link to reverify your website: https://www.google.com/webmasters/verification/
Dr. Elijah Clark (August 10, 2014). We tried to reconfirm ownership of your… [Web log post]. Retrieved from https://elijahclark.com/we-tried-to-reconfirm-ownership-of-your/