What do I have to do if my TCP certificate is no longer valid?

If your flight attendant certificate is no longer valid (unless the certificate has been suspended or revoked) you will have to re-take the initial training at an approved centre or air operator, take the associated examination and re-apply.

The issue may in this case be made in any EASA member country.

Regulation (EU)1178/2011: CC.CCA.100.