When you started your tax return for 2018 did you "Start a new return" or "Transfer into a new 2018 return"?  If you started a new return you would have to manually enter it.  If you transferred to a new return, did the time limit end for carrying it forward?  That might be why.

I imported from the previous year. As the loss occurred in 2017, it has a 7 year expiry, so still 6 more years after this one. I guess I'll just manually enter the number even though it says available balance of 0 from notice of assessment before. Would be nice if TurboTax actually helped out and answered their customers.

I am having the same issue...program flaw?

It appears to be a problem with the CRA system. The CRA area for your account won't show the LPP as a loss - but there is an area to specify the loss to be carried forward in the tax program. I ended up using SimpleTax instead - their help was super fast and it's free or you can choose to donate. Not happy with Turbotax customer service.

From what I understand that Notice Of Assessment should have shown a carry forward.  I understand you as a question I needed answered wasn't answered from Turbo Tax but rather I obtained information through this community forum.