i logged in today to do it and the button is no longer on my base bag. yes i have disabled all addons. thanks
I believe, and please someone correct me if I am wrong, that the four extra bag slots was because you added an authenticator to your account. Did you perhaps disable or completely remove the authenticator? Are you playing with multiple accounts and perhaps you have an authenticator for one account but not another? Just tossing out some ideas.
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i dont have multiple accounts, i havent played in a very long time, no authenticator
" The base World of Warcraft backpack has 16 slots. You can gain 4 more slots when you add both the [Battle.net Authenticator] and [Battle.net Phone Notifications] to your account. These slots will show as locked (Modern WoW) or will be missing (Wrath and WoW Classic) until they are activated.
It can take up to 30 minutes after both security features have been added before your extra backpack slots are available —log out of the game and back in if they don’t unlock. If you wait 30 minutes and still can’t use the extra slots after relogging, [Reset your User Interface] to resolve any possible conflicts with addons.
If you remove either the Authenticator or Phone Number, your backpack reverts to its original size, the slots show as locked again, and the items in those slots are moved to free slots in another bag."
That is what I found in Blizzard support. If that isn’t of any help then I am at a loss. Hopefully someone a bit more helpful will come along shortly and see your post.
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you clearly had authenticator at some point. that is the only way to get the extra 4 slots 
OK BROTHER WHERE IS THE BUTTON TO ACTIVATE IT, that is the issue, its not on the bag anymore
go to the app store and download the bnet app for your phone once your account is connected and 2FA is turned on, the 4 slots will appear