For me it looks like Xcode 26 has problems reading SPM packages from a locally hosted BitBucket git solution.
While Xcode 16 work perfectly fine, Xcode 26 fails to load and gives "Server SSH Fingerprint Failed to Verify" as error description. Cleaning build data and DerivedData sometimes makes loading work. Any change in Package dependencies will break it again.
Anyone having same problems? How do you handle it?
I have same problem, have even tried creating a new user account on my mac to weed out any funny config in the user account, but with same problem. Yet to find a solution.
I have this problem with a private repo (which I have full access) on github.com too. Things I've tried (with Xcode not running) that did not help:
org.swift.swiftpm in both Library and Library/Cachescom.apple.dt.Xcode)Each time I try to resolve packages it fails with "SSH Key failed to verify". When I click on "Edit Credentials" it asks for my GitHub Personal Access token. I have an ssh key. It works everywhere except in Xcode - this also worked a month ago from within Xcode. This feels like it broke in Xcode RC2.
The only thing that works is to run xcodebuild -resolvePackageDependencies in the terminal in my repo root. Which is a pain when you do a lot of branch switching or merging main into the branch. This is also how I know that the key works fine and I suspect it's a problem with Xcode itself.