Re-connecting QuickBooks account is easy. Here's how.
Step 1: On your dashboard, click on Synced Accounts
If you opted for simple Deactivate while removing your QuickBooks account. You will find QuickBooks under Synced Accounts with its status Deactivated. Click on the gear icon.
Step 3: Click on Resync to proceed.
If you opted for Full Deactivate while removing QuickBooks. In this case, you will have to re-authenticate your QuickBooks account. Click on Sync and follow the on-screen directions.