Welcome to the Community, @abegandhi. I'm here to lend a hand with your payroll account.
A payroll account can be blocked for multiple reasons, such as a billing issue or for being under review. Generally, an email will be sent with information on this, as well as instructions. I recommend reviewing your email to see if one has been sent with regards to this.
Should you not see an email, I'd recommend checking the payment status with the following steps:
Click the Gear icon.
Select Account and Settings.
Choose Billing & Subscription on the left.
Review the Subscription status in the Payroll section.