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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/te9rel62/Licensing/reactivate_license.htm

Reactivating Your Tally.ERP 9 License

You need to reactivate your Tally.ERP 9 license if you have surrendered it. Reactivation could be for subsequent activation on the same computer or another computer.

To reactivate your Tally.ERP 9 license

1.    Start Tally.ERP 9.

2.    Click V: Reactivate Your License in the Startup screen, as shown below:

Note: You can alternatively, click F12: Configure > Licensing > Reactivate License.

o     If you are a Microsoft Windows standard user, and do not have the required rights, a message appears as shown below:

Click Yes, and enter your computer administrator username and password to restart Tally.ERP 9 with administrator rights.

o     If you have Microsoft Windows administrator rights, a message appears as shown below:

Click Yes, for Tally.ERP 9 to restart with administrator rights.

3.    Enter the Administrator e-mail ID and Tally.NET password in the License Reactivation screen, as shown below:

If you are the administrator of more than one site, the License Reactivation screen displays a List of Sites that can be reactivated, as shown below:

Select the license that you want to reactivate.

4.    Press Enter to reactivate. A confirmation message appears on reactivation of your license.

See also

Surrendering Tally.ERP 9 license

Configure Existing License

Reactivating Tally.Developer 9 license

Reactivating Tally.Server 9 license