Hi @Saima10
I had the same issue and solved. Hope this method solve your issue.
This is what I did:
Existing bank account is (A). I created a new bank account (B) as new payout method, got it approved, make it as default payout method then remove bank account (A). Airbnb will re-route (1 day) all upcoming payments to the new bank account (B). I suddenly received the latest upcoming payment into bank account (B) and then all old outstanding into bank account (B) within 1 day.
I hope this method also helps all other hosts. And do keep me posted cause I am almost curious whether I am just lucky or this method really works.