Probably the best advice is to start as simple as possible. Make a fresh survey with just a single Text/Filler question, and set things up with just a single tool tip on a word on the page. If that works, then you build up in complexity, testing at each point when you add or change something. Once you get it working in a nice simple environment, it should be very quick to do the same thing by wrapping your span tags around conjoint attribute and level text in the CBC settings.
You can also try out the beta of SSI Web version 8 for free until the end of the month, where tool tips are an integrated feature of the software. Sign up at https://www.sawtoothsoftware.com/product-blog/v8-beta/.