To set up a WhatsApp Business API number integrated with TallyPrime, you can follow these resources:

Refer to this video: Watch Video

Or read through this article: Read Article

Check out this video to know how to send documents on WhatsApp from TallyPrime: Watch Video

Read this article to understand the steps to be done from your end: Click here

As given in the article, you need to:
– Disable 2FA
– Do all steps in your Interakt account till you get the error in the number connection step

After you have done the above, reach out to Tally Customer Support. A support executive will reach out to you to coordinate a 10-minute window when you can provide them with the OTP for completing the migration.