Unfortunately Schedugram can't currently support accounts with two-factor authentication. That's because of how we work – because we post your images using our pool of devices, we can't leave your account logged in to one device (unless you're on an enterprise plan) as we obviously don't have one device for every customer, which would be quite costly, wasteful and resource intensive to operate!
If you have two-factor authentication turned on, you'll find that your account won't login correctly and you'll see an error. If you need to turn off two-factor authentication or check that your account has it turned off, go to your 'profile' page, then click the options toggle at the top right (the three dots). In that menu you'll find the section on two-factor authentication:
When you click on the option, you'll see whether it is switched on or off: