Ideas on this already exist multiple times. read the post I mentionned earlier.
2020 and still deleting tokens is a roulette, what a Joke Marketo!!
Reach out to support and they'll delete them for you. It's a known issue.
I did and this is not the point... to delete a token we need to reach support, great product 👏. And, if it is a known issue since last decade, why it hasn't been fixed?