Paramiko.transport: EOF in transport thread

I have below versions -

paramiko==3.0.0
paramiko-ng==2.8.10
Python 3.8.3

I am trying to connect with SFTP server using keyfile and have to upload file. but I am getting below error in logs
DEB [20230306-10:04:13.216] thr=2 paramiko.transport: Adding ssh-rsa host key for sbx.filla.in: b2dee68b81745535bb5bff4a22ca8cf0
DEB [20230306-10:04:13.266] thr=1 paramiko.transport: userauth is OK
DEB [20230306-10:04:13.277] thr=1 paramiko.transport: Authentication type (none) not permitted.
DEB [20230306-10:04:13.277] thr=1 paramiko.transport: Allowed methods: [‘publickey’]
DEB [20230306-10:04:13.307] thr=2 paramiko.transport: Trying discovered key a582af5a19658673823d3205ff383bb2 in C:/WinScpConnection/SDB_29AAAPI3182M000_SSH-Key_Vayana.txt
DEB [20230306-10:04:13.317] thr=1 paramiko.transport: userauth is OK
INF [20230306-10:04:13.337] thr=1 paramiko.transport: Authentication (publickey) successful!
DEB [20230306-10:04:13.347] thr=2 paramiko.transport: [chan 0] Max packet in: 32768 bytes
DEB [20230306-10:04:13.368] thr=1 paramiko.transport: Received global request “hostkeys-00@openssh.com
DEB [20230306-10:04:13.368] thr=1 paramiko.transport: Rejecting “hostkeys-00@openssh.com” global request from server.
DEB [20230306-10:04:13.368] thr=1 paramiko.transport: Debug msg: b’SFTP: key options: agent-forwarding port-forwarding pty user-rc x11-forwarding’
DEB [20230306-10:04:13.408] thr=1 paramiko.transport: [chan 0] Max packet out: 32768 bytes
DEB [20230306-10:04:13.408] thr=1 paramiko.transport: Secsh channel 0 opened.
DEB [20230306-10:04:13.418] thr=1 paramiko.transport: EOF in transport thread

Any help would be highly appreciated

Any updates on this?
Can anyone please help me to understand whether SFTP connection via robot framework is supported or not.
Thanks

I have just below code on my machine-

Open Connection ${HOST} port=${PORT} timeout=120
${conninfo}= Get Connection
Log ${conninfo}
Run Keyword And Ignore Error Login With Public Key ${USERNAME}
C:/FTPFiles/my_SSH-Key.txt delay=30s look_for_keys=False