tried refreshing mirror , refreshed endeavouros, pacman keys, cleared the cache still this error continues
solved by updating arch keyrings
sudo pacman -Sy archlinux-keyring
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@Ines Welcome to the forum!
Looking at your screenshot shows a lot of packages you would like to update and it seems a long time ago that you made the last updates.
In such a case it is strongly recommended to first update the keyrings (archlinux-keyring and endeavouros-keyring).