We're investigating reports from publishers, where an issue prevents uploading an iOS SDK 2.6.0 project to the App Store. For now, we removed version 2.6.0 from Cocoapods and Carthage. Publishers should use SDK 2.5.0 until further notice. Our apologies for the inconvenience.
ETA for releasing iOS SDK 2.6.1 with the fix is this Sunday - 21/6
*21/6/2020 - Update: the issue has been resolved in iOS SDK 2.6.1