The same happened to me and I’ve never had an issue before with twitch drops claiming.
Watch an old WoW stream from the official DF profile listed in the search window. My time didnt register from watching other independent wow streamers, until i did that. Hope this helps. But weirdly nobody has gotten the drop in game yet
Did you originally link your Overwatch account to your Twitch account? 
Maybe thats why, mine says WoW-Dragonflight 
My twitch is showing it as claimed, but nowhere to be found in game sadly.
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Well, hold off on that because those of us who watched 4 hours and claimed it, most of us have not gotten it yet.
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Came here to look for this, was wondering if I was the only one that hadn’t gotten it yet
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Claimed but not showing up in my inventory. Also the High Scholar’s belt generates at black out patch error on the transmuted character 
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Claimed it in twitch, but no where to be found.
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Finally showed up in my appearances tab.
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Did the Twitch watch Day 1 and claimed the drop on Twitch, still nothing, how long does it take to receive the reward??
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Can take a while. Still haven’t received mine yet. You do eventually get it though. I have had it happen twice where it takes like a week later to actually have it show up afterwards.
I watched over 8 hours of streams that had WoW Dragonflight Drops in their title, but can’t seem to find the drops anywhere, including on the Twitch Drop Inventory page. What do I need to do to claim this MOG?
Totally forgot about this, luckily it wasn’t anything too good.
Man I still didn’t get mine. Even though I watched all the stream time needed and clicked claim. Still haven’t received it in game yet.
I still don’t have it yet even though I watched and clicked claim on the twitch inventory page. Kind of annoying really.