Thanks for contacting us regarding your concerns.  Photos of the tree, and where you are growing it, can be helpful in determining if conditions are appropriate.  How you are caring for the plant can determine whether it is getting enough light and water to produce flowers.  I am assuming this is an indoor plant? Do you move it outside during the summer?  Is it 'Ponderosa' or 'Meyer' which do best as house plants. Citrus plants grow naturally in tropical and subtropical regions. They thrive with warm temperatures, high humidity, and sandy, slightly acidic soil.  A minimum of 6 hours of bright light is needed. They also need consistent moisture.

I am including some references that may help guide you in what your issues may be.
University of Minnesota: https://extension.umn.edu/houseplants/growing-citrus-indoors
University of Maryland: https://extension.umd.edu/resource/growing-dwarf-citrus/