Turtles not laying eggs

Found and bred countless of turtles on their home beach, have tried just about everything to get them to lay eggs but they will not.

1. Made sure to find two turtles together on beach 
2. made sure there was enough area of sand 
3. waited several game days 
4. tried pushing turtle into water in the case they weren’t on home beach but they would crawl back towards where they were found 

not quite sure what to do next