Comcast installer comes tomorrow to put in CableCARD in my Tivo, but in the meantime completing as much setup as possible. Tonight was disconnecting cable from cablebox and plugging directly into the new box to see what would happen. Happily the tv signal just started working. As a bonus, it’s actually managing to both change the channels (by magic, afaik—the old box uses an iR blaster to change the cablebox more or less manually, and with great mirthful error resulting in lots of Filipino TV showing up under my Desperate Housewives subscription) AND to record two channels at once. Super magic. Obviously this is just SD and a basic set of 80 channels, but as I don’t have any premium stuff recording for a day or so, it’s all good.
So, I figured I would keep going. First stop: Online Scheduling. I logged in to Tivo and headed to that part of the site, where I was informed “Sorry, there are no TiVo DVRs in your account. You can still browse TiVo Central Online, but you won’t be able to record shows from the Web.” K fine. I go to set one up. It asks for my Acct number. Got it from the Tivo itself, which also proclaims my account to be in good standing. Step 2: Payment. no. no no no. I transferred my lifetime membership already. Did it the day it arrived. No going forward.
Read up on the problem in the forums. Nothing helpful, other than a random comment to try setting it up by linking my Yahoo and Tivo accounts (you can use the tv.yahoo.com interface as an alternative.). K… try to set that up, and get this:

Waa. Go back to Tivo.com and try to enter the acct number again to see if I made a typo. Now, the error message is “Sorry that’s already been activated” but eveywhere else it still reports that there are no DVRs associated with this account.
Then I remember a comment the Tivo transfer rep made: “You have two accounts.”
So… either 1) Tivo.com is bamboozled by me having a dangling account somewhere, and I need to get them merged, or 2) the Tivo.com ulfillment chain is missing the link that fully integrates a Tivo activated by transferring a lifetime membership.
I have a handful of non-premium channel season passes set up for now, and hoping that I am lucky enough to have a clueful installer and a working card tomorrow (I’m hopeful with white knuckles: The official Tivo forum had a bunch of posts bitching about Comcast + CableCARD nightmares matching all the random interweb posts out there.)
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I just bought my first Tivo (series 3) and was having the same “Sorry, there are no TiVo DVRs in your account. You can still browse TiVo Central Online, but you won’t be able to record shows from the Web” problem when trying to schedule from the web.
Did you every resolve the issue?
Yep - I called TiVo support and gave the CSR various ways to find my accounts (Luckily I have a minimal number of junky e-mail addresses and a constant address for 10 years). She was able to find them and merge the accounts so that both of my DVRs show up. It must be a standard enough thing, as I received a templated e-mail “Your TiVo accounts have been merged.”
Sounds quite different from your problem though, if this is your first TiVo and account. The CSRs seem very clueful and nice, so give them a call and see if they can help.