HomePod setup fails with error -7005

Homepod setup gets a -7005 message. Ideas? (I've reset twice to factory settings. Didn't help. It seems that it gets stuck while attempting to set the Apple account, but I'm not sure. It's a second homepod in the same room and network, so to see if it's a network or systemic problem, I removed the first homepod from the network - easily set it up again.)