When your tickets are set to inactive it means that the tickets are not on sale. This can have a number of reasons.

The tickets are not linked to a sales channel:

Linking an event and ticket(s) to a sales channel

Is the ticket not listed here? Check whether the ticket is linked to an event and date:

Linking or changing an event and date to a ticket

The availability of the ticket is not on the correct date

Change the availability of a ticket