Ssh key authentication failed

[Udo1]

Hello
we have the device TRB140.
We want to connect from our debian server with ssh key authentication.
I have configured the device by dropbear manual:

SSH RSA key authentication (Linux) - Teltonika Networks Wiki

admin@TRB140:~/.ssh$ pwd
/usr/local/home/admin/.ssh
admin@TRB140:~/.ssh$ ls -ltra
drwxrwxr-x 3 admin user 360 Jul 10 18:43 ..
drwx------ 2 admin user 232 Jul 10 18:48 .
-rw------- 1 admin user 852 Jul 21 12:02 authorized_keys

But when I connect from our server it is not successfully:

debug2: pubkey_prepare: done
debug1: SSH2_MSG_EXT_INFO received
debug1: kex_input_ext_info: server-sig-algs=<ssh-ed25519,rsa-sha2-256>
debug2: service_accept: ssh-userauth
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug1: Authentications that can continue: publickey,password
debug1: Next authentication method: publickey
debug1: Offering public key: /omd/sites/aspcentral/.ssh/id_rsa RSA SHA256:…
debug2: we sent a publickey packet, wait for reply
debug1: Authentications that can continue: publickey,password
debug1: Trying private key: /omd/sites/aspcentral/.ssh/id_dsa
debug1: Trying private key: /omd/sites/aspcentral/.ssh/id_ecdsa
debug1: Trying private key: /omd/sites/aspcentral/.ssh/id_ecdsa_sk
debug1: Offering public key: /omd/sites/aspcentral/.ssh/id_ed25519 ED25519 …
debug2: we sent a publickey packet, wait for reply
debug1: Authentications that can continue: publickey,password
debug1: Trying private key: /omd/sites/aspcentral/.ssh/id_ed25519_sk
debug1: Trying private key: /omd/sites/aspcentral/.ssh/id_xmss
debug2: we did not send a packet, disable method
debug1: Next authentication method: password
admin@172.x.x.x’s password:

How can I debug the error?

Best Regards
Udo

[Matas]

Hello, you’re connecting as the user admin not as root. Please try logging in with the username root.

Regards,
M.