Regarding the OAuth issue, I believe I need to sign in again if I switch Xcode versions. For example, I signed in with Xcode 26.4 to use Claude agent, but when I switched to Xcode 26.5 and tried to use the agent again. Xcode will show the authentication failure message. Failed to authenticate. API Error: 401 {"type":"error","error":{"type":"authentication_error","message":"OAuth token has expired. Please obtain a new token or refresh your existing token."},"request_id":"req_011hoAXioU8pMsLnmS3c"}

Using Xcode 26.5 Beta with iOS Simulator 26.5 Beta (iPhone 17 Pro), I tried to copy and paste text to the simulator. The paste menu now appears, but cannot paste the text. When pasting the text to the UITextField in my application while debugging, Xcode shows the following error ...requesting item failed with error: Error Domain=PBErrorDomain Code=13 "Operation not authorized." UserInfo={NSLocalizedDescription=Operation not authorized.}

From my experience, they sometimes require additional documents from you. Therefore, calling to find out what caused the issue is much quicker than asking the question here.