E-Invoice generation feature not working in BUSY. Common reasons for failure and how to fix?

To fix and know the reason why the E-Invoice generation feature is not working in BUSY, you need to try the below option to enable or not to check the failure:
 Step 1: Make sure your e-invoice configuration is done from Administration, then Configuration, and selecting Features or Options. Choose GST or VAT and enable the e-way bill as required. Enter relevant details, like place, pin code, etc., in the configuration window.
 Step 2: Make sure your GSP configuration is done from GSP configuration, select the GSP for e-way bills and e-invoices, and enter Webtel and Pinnacle's user ID and password. Click on validate to verify the credentials.
 Step 3: Make sure your Webtel and Pinnacle's configuration is done by generating Webtel and Pinnacle's ID and password from the E-way bill portal. Log in to https://ewaybillgst.gov.in/, click on login, enter E-way bill login and password, go to Registration, select For GSP, send OTP, verify OTP, and create the user for Webtel and Pinnacle.
 Step 4: Ensure that Voucher Series Configuration is set to generate an e-way bill after saving.
 Step 5: Verify that the QR code print option is enabled in the sales invoice bill print option. Enable Print E-Invoice IRN, Ack. No., Act Date, and QR Code from Administration, then Configuration, then Invoice/Document Printing. Find your sales invoice, whether it is standard or advance, and enable the option accordingly.
 By following these steps, you can ensure that your e-invoice features will work.