That's a bug in the Online software that's just been discovered in the last few days as the Brokerages just released millions of 1099-DIV forms over the weekend.. (not a problem with the Desktop software).
It may take a few weeks to get fixed....check on Fridays, since software updates usually occur only on Wed or Thurs evenings.
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See discussion here where the software BUG was confirmed:
https://ttlc.intuit.com/community/taxes/discussion/re-why-does-turbotax-page-not-accept-the-value-i-...