Could not verify server key. The OpenPGP server key defined in the config could not be found in the GnuPG keyring

[mzanetti]

Here it says something about deleting a user and creating a new one… but I’m not sure how to do it.

The private key cannot be used to do anything here

You need to perform a user account recover (or create a new user and follow the setup) for the new server key to be taken into account by the user browser extension.