Interesting! My oldest payout is also 49 days. And I’m also waiting on reply from third-party tax support service via itch.
I emailed itch support to see if there was Plan B, but there has been no reply.
My situation was resolved after 50 days, my payouts arrived shortly after the email saying things were resolved.
I had no part in the solution, no further information was needed from me, everything was itch-side.
No information has been given so far as to the nature or whereabouts of the problem.
Good luck everybody!