I have entered my capital loss carryover from last year, but Turbotax proceeds to summarize that I have $0 of loss carryover. Not understanding why?

It may not be carrying it over because it may be applying it toward your ordinary income in this year, since the amount appears to be under $3,000.  To check to see if this is the case, look at Line 7 on your Form 1040.  If you see a negative number there, then that may explain what you're seeing on the summary screens. 

Here is how to preview your return to check for this:

1. From the left rail menu in TurboTax Online, select Tax Tools (You may have to scroll down on the left rail menu.)
2. Select Tax Tools 
   
3. On the drop-down select Tools 
4. On the pop-up menu titled “Tools Center”, select View Tax Summary 
5. On the left sidebar, select Preview my 1040 
6. Scroll down to Line 7 and check to see if there is a negative number here