I don't ever get asked for a Captcha, perhaps because I have mine set in the account settings to either use an authenticator app to get a code to log in each time or to send me a code by text. But I don't have to fiddle with any Captcha--it immediately sends the code to my authenticator app or texts to my phone when I choose.
If your 2-factor authorization was already off, then I don't know anything more about that. You'd have to talk to TurboTax Support to see what you can find out. If you're getting 2FA anyway, then maybe they require it for everyone by default.
I think my problem may be is that I have 3 User IDs -- all with the same email address. (I may have created one each for Intuit, Turbotax and Community.) How do I delete two of them -- so that I can use the same User ID for all three?
You said your Intuit Account, your Online TurboTax, and Community have three User IDs with "the same email address". Does that mean you can sign into each one with the same User ID but have underlying same email address, or did you sign up for each of those separately and created a different User ID for each?
Typically when a new user for the first time establishes an Intuit Account ID, that same User ID (which for many people is an email address) can then be used on all Intuit platforms--to sign into Online TurboTax, to sign into Intuit Account, to sign into the Community, or other Intuit products. In fact that's what I personally have. My user ID can be used to log into all 3 places with the one same Intuit User ID. I can use it to log into any of those separately if I need to, and while logged in can sometimes switch between them. If that's what you mean by "3 User IDs with the same email address" (if the User ID is an email address) then that's normal--that's just 3 sections of a same Intuit User ID account.
If, however, each of those sections were created independently with a different User ID log-in, then that's like having multiple accounts. To make if more confusing, one can use the same address for underlying notification purposes in multiple accounts; i.e., the email address in "Sign in and security" (not the User ID) can be used for notifications in up to 5 accounts. When someone just mentions "email address", that can be confusing, since they are sometimes talking about their User ID (which can be an email address), or they may be talking about the account notification email.
In any case, you may wish to talk to TurboTax Support. It would likely be easier for them to understand your situation in a one-on-one conversation, and they can tell you what options you have.
Support hours this time of year are 5AM-9PM, 7 days a week.
TurboTax Support
https://ttlc.intuit.com/turbotax-support/en-us/contact/
