If it is not irrigated--perhaps your site is a bit too hot for perennial rye. It is fine up to 90 degrees. Sometimes if you plant a mixture of blue and rye--90 percent rye comes up, and not much blue. Perhaps overseed with TTTF, using a top tier cultivar, which is suited for your area and disease resistant. Be sure it has resistance to brown patch and has endophytes for insect resistance. Use 8 pounds per thousand--you need 80 pounds. Costs more--but better. Choose from the top 25 in the NTEP trials--if possible.
Or...do as Humble suggests, but stay away from cheap seed.
Check to see how much blue you have--if you find no rhizomes--you have perennial rye. (Or had.)