Precise Orbit Determination (POD) of the Copernicus Sentinel satellites is a task of the Copernicus POD Service. For the generation of the non-time critical (NTC) products the Precise Point Positioning – Ambiguity Resolution (PPP-AR) approach is applied using the GNSS (Global Navigation Satellite System) data from the onboard receivers. The corresponding GNSS products (orbits, clock corrections, observation-specific signal biases (OSBs)) are stemming from the Center for Orbit Determination in Europe (CODE), one of the analysis centers of the International GNSS Service (IGS). Recently a combined product has been published by the Wuhan Combination Center (WCC), which includes combined orbits, clock corrections, and OSBs for PPP-AR applications. This IGS WCC product is analyzed and applied for Sentinel POD. Additionally, other available IGS analysis center products, which include OSBs, are analyzed and the results are compared with each other. All resulting orbits are compared to orbit results from the Copernicus POD Service. When using the different IGS AC and WCC products for Sentinel POD with integer ambiguity resolution differences in the quality and reliability are observed. Main reason is that not all OSBs needed for the ambiguity fixing are provided in all products. This restricts the usage of some of the products for Sentinel POD. The new experimental IGS combined product (WCC) shows an excellent performance in single-system POD solutions, it is only outperformed by the CODE products when using their clocks with the 5 s sampling.