Creating a logo with only two letters can be challenging because it can be difficult to create a design that is both visually appealing and effectively represents the brand. With only two letters, there is limited space to work with, and it can be hard to come up with a unique and memorable design that stands out from other logos. Additionally, it can be challenging to find the right balance between the two letters, ensuring that they are visually balanced and easy to read while still being aesthetically pleasing. However, with the right design skills and creativity, it's possible to create a great logo with just two letters.