This issue has been resolved by TurboTax. You may need to clear your cache and cookies. Make sure your return is saved in your TurboTax account and then sign out. Clear the cache and delete the cookies on your computer, open a new browser, sign back into your account and try entering your information again. You may also want to change browsers, for example, if you are using Chrome, try switching to Firefox.
In addition to clearing your cache and cookies, you want to make sure your operating systems are up-to-date as well.
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Edited on 03/05/2021
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