obsidian-git: Pushing not working

I’ve installed this plugin, but I’m unable to push or pull commits. Whenever I push, the plugin creates a commit, but fails on pushing with this error (from the console). I have access rights to the repository, and I can push from the command line, so I’m not sure what the problem is. I’m on Ubuntu 20.04, and ssh-askpass is installed. I connect to my repository using SSH, not username/password.

The error and stack in question:

Uncaught (in promise) Error: Pushing to github.com:NicholasMamo/xyz.git
ssh_askpass: exec(/usr/libexec/ssh-askpass): No such file or directory
git@github.com: Permission denied (publickey).
fatal: Could not read from remote repository.

Please make sure you have the correct access rights
and the repository exists.

    at GitExecutorChain.onFatalException (eval at <anonymous> (app.js:1), <anonymous>:2536:85)
    at GitExecutorChain.eval (eval at <anonymous> (app.js:1), <anonymous>:2527:28)
    at Generator.throw (<anonymous>)
    at rejected (eval at <anonymous> (app.js:1), <anonymous>:2482:65)