It happened to me too when I returned for the second time playing AL. Before I always play AL on chrome, now I'm on my phone. The friendlist was gone!! It's very sad really because my friendlist was full of good friends that always help me in the past. And then I resolve this by logging in on chrome, and *poof* all of my friendlist was there. (At least that was I remember)
Did you start playing AL on a platform then you played it on another different platorm (such as Android to Chrome)?
If yes, I might suggest you to play AL on the first platform that you played AL previously to see it works.
Hope this post helps and welcome back
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