I cannot access any training profiles or code signing identifiers that I created in the project settings. This does not mean that I did not download the preparation profiles or installed the correct certificates, but nothing is displayed in the project profile settings in the project settings:

Again, I made sure that you imported the profiles and certificates correctly. Here, as my account appears in the "Settings"> "Accounts" section:

I'm running out of ideas. I revoked my existing certificates, deleted all provisioning profiles, and recreated everything.
I also created a dummy project from Apple, included in the iOS Master-Detail template. This showed the same behavior when there were no code signing identifiers or preparation profiles available in the project build settings.
I am quite open to all ideas. Thanks.
Update
As I already mentioned, pop-up windows with code are not displayed, even if they were correctly created and loaded via Preferences / Accounts.

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