I filed for an extension with Turbo Tax but I don’t see anywhere on the site indicating that I filed and I didn’t receive email confirmation. How do I know it registered?

If you e-filed your federal tax return extension using TurboTax Easy Extension, you will get an email confirmation letting you know if it was accepted or rejected, usually within 48 hours. 

Please click this for more information:

https://turbotax.intuit.com/tax-tips/tax-extensions/what-to-do-after-youve-filed-an-income-tax-exten...