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Stuck running sftp server on termux alpine for multi-user setup

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The below is my journey trying to get multi-user sftp working using alpine on termux

pkg update && pkg upgrade
pkg install proot-distro openssh

proot-distro install alpine

proot-distro login alpine

apk update
apk upgrade

apk add openssh shadow sudo

apk add vim

vim /etc/ssh/sshd_config

Port 8022
PermitRootLogin no
PasswordAuthentication yes
Subsystem sftp internal-sftp

Match Group sftpusers
    ChrootDirectory /sftp/%u
    ForceCommand internal-sftp
    X11Forwarding no
    AllowTcpForwarding no

addgroup sftpusers

adduser user1
adduser user1 sftpusers

mkdir -p /sftp/user1/upload

chown root:root /sftp/user1
chmod 755 /sftp/user1

chown user1:sftpusers /sftp/user1/upload

How I run my server each time

pkill sshd
rm -f /etc/ssh/ssh_host_*
ssh-keygen -A
/usr/sbin/sshd -D -d -d -d

From another termux session

sftp -P 8022 user1@127.0.0.1

Connection reset by 127.0.0.1 port 8022
Connection closed

Some troubleshooting steps

mkdir -p /run/sshd
chmod 755 /run/sshd

grep sshd /etc/passwd
sshd:x:22:22:sshd:/dev/null:/sbin/nologin

This is where I am stuck
sshd debug output:

debug3: ssh_sandbox_init: preparing seccomp filter sandbox [preauth]
debug3: privsep user:group 22:22 [preauth]
debug1: permanently_set_uid: 22/22 [preauth]
permanently_set_uid: was able to restore old [e]gid [preauth]
debug1: monitor_read_log: child log fd closed
debug3: mm_request_receive: entering
debug3: mm_request_receive: monitor fd closed
debug1: mm_reap: child exited with status 255
debug1: do_cleanup
debug1: Killing privsep child 13150
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