If you are using allocated seating, assigning tickets to a fixture will not automatically make these tickets live to fans.
To make them available for purchase, follow the steps below.
Click on the selected fixture
Check under 'allocated seating' that you have assigned the correct tickets to the correct stands
Look for the 'on sale' toggle at the top right of the screen
Click on the Toggle to make your tickets live
If you need any more help with making tickets live for Allocated Seating fixtures, please do not hesitate to get in touch at support@fanbaseclub.com and we'd be happy to help!