Can't ssh into pfSense as non-admin with authentication keys

[moogle]

For some strange reason I can't seem to ssh into pfSense as a non-admin user while using a ssh authentication key. If I generate a public key using ssh-keygen and paste it into "Authorized Keys" for the admin account I can login with no problems, but if I add the same key (for testing purposes) for a user with limited rights I get a "Permission denied (publickey)" error.

Does anyone know how to fix his problem?

[jimp]

Can you login with that same user without a key? (just password?)

Does the user actually have shell permissions assigned?