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A new GSTR-2B API is applicable from 14th Nov 2024, which affects auto-reconciliation of GSTR-2B for Oct-24. Stay tuned for our upcoming release, TallyPrime 5.1, which supports this and makes reconciliation even smoother.
https://help.tallysolutions.com/docs/te9rel54/Licensing/activate_license.htm

Activating Your Tally.ERP 9 License

You need to activate your Tally.ERP 9 license  to use all the features of the product. Activation is a process to validate and authenticate the license. Your product Serial Number, Activation Key, and e-mail ID are required to activate the license.

To activate your Tally.ERP 9 license

1.     Right-click tally.exe, and select Run as Administrator.

2.     Click A: Activate Your License in the Startup screen, as shown below:

3.     Enter your Tally.ERP 9 Serial Number, Activation Key, and Administrator e-mail ID, as shown below:

Note: The e-mail ID provided is linked to your Tally.ERP 9 Serial Number, and can be used for all further licensing operations, and interactions with Tally Solutions.

4.     Press Enter to activate your license. A confirmation message appears, as shown below:

5.     Press Enter to view the Unlock License screen.

6.     Enter the Unlock Key sent to your e-mail ID in the Unlock License screen, as shown below:

7.     Press Enter to unlock your license. A confirmation message appears once you unlock your license.

On activation, the license details are displayed in the Information Panel.

See also

Configuring Tally.ERP 9 License

Activating Tally.ERP 9 Multi-Site Account