Payout Button is Greyed Out even i crossed minimum payout limits

You need to fulfill all the requirements, including having submitted your tax form. 

Once you’ve accrued more than US$25 in royalties on Adobe Stock, you can request a payout as long as the following criteria is met:

• You've got a validated tax form on file in your account.

• At least 45 days have passed since your first Adobe Stock sale. (You can make subsequent payment requests when you reach the US$25 threshold again).

• You've got a valid PayPal, Payoneer, or Skrill account available to receive funds. 

The 45 days start after your first sale, so when did that occur?

Has it been more than 45 days since your first sale?