This work investigates the static bending of a bi-directional functionally graded porous (BFGP) microshell using Kirchhoff–Love’s shell hypothesis, the modified couple stress hypothesis, and the isogeometric analysis technique (IGA). An exponential rule governs the mechanical characteristics of the entire shell, which is supported by an elastic medium. There are two forms of porosity: even and uneven. This approach is unique in that it takes into account the change length-scale parameter as the mechanical characteristics of the material. The validity and effectiveness of the established model are shown by contrasting the numerical results produced by the present formulations with data that have been published in a number of particular circumstances. Furthermore, the influence of properties like porosity, length-scale factor, elastic medium stiffness, and other parameters on the microshell static bending is studied numerically.