Mass estimates of GJ 3090 b under different planetary configurations and different stellar-activity kernels. The models range from single-planet solutions (GJ 3090 b only) to multi-planet scenarios, including the 16-day confirmed planet (GJ 3090 c) and candidate planet at 13 days. The three-planet models are also shown with different kernels and a model with a non-zero eccentricity on GJ 3090 b. The adopted model is shown in black. The mass constraints from A22, O24, and an independent reanalysis of the 55 archival HARPS data points are also shown. A dashed horizontal line separates the models tested in this work from previously published mass estimates and a re-analysis of the HARPS archival data.