Problems with updating Vault


I followed the Official Packaging Guide but still encounter the NO_PUBKEY AA16FCBCA621E701 error while trying to update on my Ubuntu VM.

When first installing Vault, I used those commands :

curl -fsSL | sudo apt-key add -
sudo apt-add-repository “deb [arch=amd64] $(lsb_release -cs) main”
sudo apt-get update && sudo apt-get install vault

I used the apt-key del command to delete the old key. I also tried doing “curl -fsSL | sudo apt-key add -” again to see that the new key was indeed added, but still get the same error.

Could you help me get what I am missing ?

Thanks in advance for your help !