Xcode doesn't download the “manual” provisioning profiles for my iOS apps, and when I do so from the site there's no way to install them properly. One day Apple will have to fix this, it's really the annoying thing every time we renew our certificates or update macOS and Xcode!

A lot of old messages about CSSMERR_TP_NOT_TRUSTED error, but nothing I've found about certificates generated non valid by Xcode itself. Looking at certificates in my keychain and all is green except my new development certificate. I'm using MacOS Catalina and Xcode 12.4 (12D4e). Requesting a certificate to Apple after generating a demand in the keychain tool does the same thing. Is there something wrong on my freshly reinstalled computer or Apple certificates generator are failing today ?