Hi there, anthemmusicenter,
Let me clarify things out for you. QuickBooks Online has a different login page. Therefore, you're unable to see your Self-Employed (QBSE) and TurboTax account even if the login credentials are the same.
In QuickBooks Online (QBO), you have the option to select the company you want to open when you have multiple accounts. See the attached screenshot below for your visual reference.

If you wish to move your QBSE data to QBO, you have the option to manually or automatically perform this process. Feel free to read through this article: Switch from QuickBooks Self-Employed to QuickBooks Online for instructions and detailed steps.
Or if you need to send your QBSE tax information to TurboTax, please refer to this link: Send your info to TurboTax if your QuickBooks Self-Employed account is different from your TurboTax ....
Should you need anything else, click the Reply button below. Just mention my name, and I'll get back to you.