Testing the Addition of the AKT Inhibitor, Ipatasertib, to Treatment With the Hormonal Agent Megestrol Acetate for Recurrent or Metastatic Endometrial Cancers

Inclusion Criteria: * Patients must have grade 1 or 2 recurrent or metastatic endometrioid endometrial cancer * Patients must have measurable disease according to RECIST version (v)1.1. Measurable disease is defined as at least one lesion that can be accurately measured in at least one dimension (longest diameter to be recorded). Each lesion must be \>= 10 mm when measured by CT or MRI. Lymph nodes must be \>= 15 mm in short axis when measured by CT or MRI. Previously irradiated lesions can be considered as measurable disease only if progressive disease has been unequivocally documented at that site since radiation * Patients may have received unlimited prior lines of therapy. If patient received prior hormonal therapy (e.g., megestrol acetate, medroxyprogesterone acetate, aromatase inhibitor, tamoxifen, fulvestrant) it must have completed at least 6 months prior to registration * Age \>= 18 * Eastern Cooperative Oncology Group (ECOG) Performance Status of 0, 1 or 2 * Platelets \>= 100,000/mcl within 14 days prior to registration * Absolute neutrophil count (ANC) \>= 1,500/mcl within 14 days prior to registration * Hemoglobin \>= 9 g/dL within 14 days prior to registration * Glomerular filtration rate (GFR) \>= 60 mL/min/1.73m\^2 measured using Cockcroft-Gault equation or the estimated glomerular filtration rate from the Modification of Diet in Renal Disease Study within 14 days prior to registration * Total bilirubin =\< 1.5 x the upper limit of normal (ULN) within 14 days …