GPG — Synchronisation between machine and “No secret key”

I am running “pass: the standard unix password manager” v1.7.3 on Fedora 31.

I create a password for “mysite” via

$ pass generate mysite

It creates an entry in my .password-store folder: mysite.gpg which is the encrypted password.

But somehow, I can’t decrypt this file :

$ pass mysite

gpg: decryption failed: No secret key

$ gpg -d mysite.gpg

gpg: encrypted with 2048-bit RSA key, ID 4B***********AD, created 2019-10-08
      "User1 "
gpg: decryption failed: No secret key

Here are some more informations:

$ gpg –list-secret-keys

/home/user/.gnupg/pubring.kbx
--------------------------------
sec   rsa2048 2019-11-29 [SC]
      DF2*************************************B3D
uid           [ultimate] User2 
ssb   rsa2048 2019-11-29 [E]

$ gpg –list-keys

/home/user/.gnupg/pubring.kbx
--------------------------------
pub   rsa2048 2019-11-29 [SC]
      DF2***************************************B3D
uid           [ultimate] User2 
sub   rsa2048 2019-11-29 [E]

pub   rsa2048 2019-08-17 [SC]
      6A2***************************************18D
uid           [ultimate] User3 
sub   rsa2048 2019-08-17 [E]

pub   rsa2048 2019-10-08 [SC] [expires: 2021-10-07]
      759***************************************6C0
uid           [ultimate] User1 
sub   rsa2048 2019-10-08 [E] [expires: 2021-10-07]

Moreover, initially, the .password-store folder was created on an other machine. I just type “pass generate mysite ” and the “no secret keys” on my current machine.

I read here
https://stackoverflow.com/questions/28321712/gpg-decryption-fails-with-no-secret-key-error
that I should import some secret keys but I don’t know which one and on what machine.

Any help to debug this problem ?

Note that the command :

$pass generate essai2

is still working but

$pass essai2

yields the same error: “No secret key”.

ps: I really need the password stored in “mysite.gpg”, is it possible that the clear password can be lost ?