If anyone is using #eero and noticing oddities today, about ~20 hours ago, Eero support indicated a problem with their app. But supposedly as of 5 hours ago it was "resolved".
Right now, if you try to use the app, it will claim you're not signed in. If you attempt to sign in via email / phone number, it may initially say it doesn't recognize the address.
Keep trying. They're under load as -everyone- is having to sign back in again.
Be aware: your port forwards may be nuked and need re-doing