I have completed my 6-month probation period with TCS. However, I have not received any confirmation email or official communication?

Yes, for me it was 3 months probation as I switched from Accenture after 5 years.
You can find it beside your offer letter in Ultimatix - documents

It is auto generated. U don't need to email anyone. I wasn't aware of this and emailed my manager and his manager and followed up several times only to check myself that it was there exactly after 3 months. 😂😂😂

For official letter, check under My Documents in Ultimatix

Not received any documents

My Probation was 3 months . Your manager has to approve. Ask your manager.