Yes I am seeing this to some of my accounts too!
Sometimes clear cookie and clear error notifications will fix it. If still not fix you will have to rest the account for 24 hours. Most of the time it will work again.
I have also found after an account get this block, it’s very likely for it to get AC
Unless you have selected to only do all actions in EB, which would in return disable alot of other tools, then yes the api is still being used behind the scenes… and only follows, likes, comments, story views are thru the EB.