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Now manage multiple licenses together using the multi-site license feature in TallyPrime. Assign a unique site ID to each license under a single Tally.NET account for a hassle-free licensing experience.
https://help.tallysolutions.com/docs/te9rel63/Error_warning_message/TSS.htm

TSS - Error Messages

This topic lists commonly appearing TSS-related error messages.

1. To complete this action internet connectivity is required. Connect to internet and try again.

2. Tally.ERP 9 is running in educational mode. Use a valid license to complete this action.

3. A valid TSS is required to complete this action. Renew TSS and try again.