In the ArcGIS Navigator 20.0.1 (Android) app, it is unable to open a mobile map package (MMPK) that contains address locators created by the Create Locator tool in ArcGIS Pro 2.6 due to an unsupported MMPK version error. The same MMPK can be opened if the locator is created by the Create Address Locator tool in ArcGIS Pro 2.6.