I just had the very same issue. I have returned to using Wonder Watt, after being a very early user, once Intelligent Flux became available, I switched over to allowing Octopus to control my battery.
I am at best sceptical that Intelligent Flux has done anything positive for us, and as I recently had our battery array extended, it has become really obvious that we're peing prevented from charging using solar, instead being forced into a meaningless exhange of 'lower rate' electricty between us and Octopus, and not being able to fully utilise anywhere near our now much larger export capacity during the higher rate window.
So, I dusted off my Wonder Watt credentials and am happy to be back in the fold!
But, all was not well, as Wonder Watt kicked in twice to start off my cheaper 30 minute segments for import, only for Octopus to twice reinstate the revoked API Token and stop my cheap import!!
So, as well as revoking the API Token now for a third time, I have deleted the API Key assigned to Octopus R&D in the hope that this wll disable Octopus' ability to interfere. Does this sound about right?
UPDATE I've just logged back in to see that as I was typing the above, Octopus have indeed reinstated the API Token and I've a battery sat there idle on one of the sunniest days of the year