Mine bloomed late in the summer last year. I think it needs some sustained sunshine and warmth to bloom. It may just be too early yet.

I think you need to wait a little. I have three Rangoon Creeper vines, all in the ground. The one closest to the house (i.e., the most protected) never lost its leaves completely, and started new growth and is studded with buds now. The other two, on a structure out in the open (i.e., not so protected) are just beginning to put on new growth. I thought I had lost them, but fortunately, they are coming back. You should see some buds in the next few weeks. Good luck.