Neither TurboTax Desktop nor TurboTax Online support Form 8621, so you won't be able to use TurboTax to prepare those. You can go to IRS Form 8621 and complete the form. You will have to print and mail your return in order to attach Form 8621.
As for TurboTax Online not being able to be e-filed with Form 1116 "whenever your taxes have been paid in foreign currency", Form 1116 requires all amount to be reported in US Dollars except where specified in Part II. If you are completing Part II, I recommend you use TurboTax Desktop. Where are you seeing that you cannot e-file?
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