Why didn’t my hibiscus flower open up this morning?
Spin the bottle is the name of this variety.
Have you had other flowers on this plant that opened? If so, every once in awhile, a flower will fail to open. It's just something that happens. If it's something that happens frequently, you should double check that the watering, light, soil, and fertilizing are correct. This article has information: https://www.gardeningknowhow.com/ornamental/flowers/hibiscus/how-to-care-for-hibiscus-plants.htm