Yes, you can use your BC services card app to log into your CRA account through Auto-Fill. - Please follow these steps: Click on Sign into CRA, once there scroll all the way down past options 1 and 2- and click on "CRA sign-in services".   Next you will click on "My Account" then scroll down until you see "Provincial Partner Sign In" then choose BC. 

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I noticed the same thing this year. The option is there if I go directly to the CRA website or if I go in through my BC Services card but when I'm trying to file my taxes, there is no link to use the services cards from Alberta or BC. It was a big pain in the butt and took me 4 hours to file online because of it.