We look forward to the Daffodil season and so it is doubly disappointing if instead of cheery yellow or white flowers everywhere there are just leaves.
The good news is that if you are looking at patches of bulbs which have not flowered now is the time to take the measure of them and persuade them to bloom next year.
A high potassium feed, such as tomato feed, will help especially if they are growing on poor soil. The bulbs for next year will be forming over the coming weeks so feed them if it is dry water them and remove any flower heads (not the greenery) when the flowers have faded.
If you have a nagging feeling that maybe the bulbs were planted too shallow, they need to be 3xbulb depth now is also the time to dig them up. Check the depth and then replant at least 3 times the depth of the bulb.
Hopefully, you will not be so disappointed next year.