The Tablo servers were online briefly, and went back down.
I'd wait until @TabloTV reports back with status.
In the meantime, here's some advanced info to help with your eventual setup.
I have multiple Tablos, and just set a new one up yesterday.
Here are issues you may run into.
Your Tablo firmware version will probably not be the latest, which is v2.2.18, and your Tablo will prompt you to upgrade.
Mine was at v2.2.14, and it prompted me to upgrade to v2.2.16, and v2.2.18 later.
1st attempt to upgrade the firmware got my Tablo stuck on step 1 of 3 at 0%.
Pressing the reset button did nothing.
Only power cycling the Tablo brought it back to something useful.
I was able to upgrade the firmware only after I enabled my lifetime guide subscription, which I purchased 3 years ago for my first Tablo.
Multiple Tablos can share the same lifetime guide subscription.
I don't know if I just had bad luck, but at least you know what you need to do to get your Tablo unstuck from the firmware upgrade, if you need to.