I just completed all of Season 21’s Seasonal Journey, all the way through Guardian. I got the pet and both portrait frames. When I completed Guardian, there was an in-game banner that briefly said “+1 Stash Tab”. Well, I didn’t get a stash tab. I have the same number of stash tabs that I had before I completed Guardian.
How many stash tabs do you already have ?
The maximum is 11 if you didn’t purchase the Necro DLC and 13 if you did.
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I have 13. It appears that Blizzard needs to update/fix their in-game banner to not show that you got “+1 Stash Tab” if you’re already at max. Thanks for confirming, Boubou! 
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Damn it, I wanted to trot out Mr. Occam again. Good post!