The project might be configured to use a code signing identity (certificate and private key) that doesn't exist on your system or is invalid. Please follow this steps:
Verify Certificates and Provisioning Profiles:
Xcode: Open Xcode and go to "Xcode" > "Settings..." (or "Preferences..."). Select the "Accounts" tab.
Ensure your Apple ID is added and your development team is selected.
Click "Manage Certificates..." to check the status of your certificates.
Click "Download Manual Profiles" to download any missing profiles.
Go to apple developer website, and check the status of your certificates and profiles.
Check Bundle Identifier:
Xcode: In your Xcode project navigator, select the project file (the blue icon).
Go to the "General" tab and check the "Bundle Identifier."
Compare this with the bundle identifier in your Apple Developer account and provisioning profile.
Clean and Rebuild:
Xcode: Go to "Product" > "Clean Build Folder" (Shift + Command + K).
Then, try building again.
Check Code Signing Settings:
Xcode: In your project settings, go to the "Signing & Capabilities" tab.
Verify that the correct team, signing certificate, and provisioning profile are selected.
Ensure that "Automatically manage signing" is correct for your use case.
Or please share more information here, so that we can understand the issue more.