SMP server fails to get HTTPS credentials, XFTP fine

The script I'm running results in the XFTP server getting up and running, but the SMP server fails with the error: no HTTPS credentials: /etc/opt/simplex/web.crt, /etc/opt/simplex/web.key

OS: NixOS

$ openssl version
OpenSSL 3.0.14 4 Jun 2024 (Library: OpenSSL 3.0.14 4 Jun 2024)

smpdomain=smp.xyz.xy
xftpdomain=xftp.xyz.xy

smprun() {
sudo certbot certonly --standalone -d $smpdomain --key-type rsa --rsa-key-size 4096
docker run \
-e "ADDR=${smpdomain}" \
-p 5223:5223 \
-v $HOME/simplex/smp/config:/etc/opt/simplex:z \
-v $HOME/simplex/smp/logs:/var/opt/simplex:z \
simplexchat/smp-server:latest
}

xftprun(){
sudo certbot certonly --standalone -d $xftpdomain --key-type rsa --rsa-key-size 4096
docker run \
-e "ADDR=${xftpdomain}" \
-e "QUOTA=20gb" \
-p 444:444 \
-v $HOME/simplex/xftp/config:/etc/opt/simplex-xftp:z \
-v $HOME/simplex/xftp/logs:/var/opt/simplex-xftp:z \
-v $HOME/simplex/xftp/files:/srv/xftp:z \
simplexchat/xftp-server:latest
}

smprun & 
xftprun

Any pointers?

Start by reproducing the shell script and inspect the SMP container's mounted /etc/opt/simplex/config directory alongside the expected /etc/opt/simplex/web.crt and web.key paths. Compare the SMP and XFTP certificate handling; done means the SMP server starts with HTTPS credentials while the XFTP server continues to work.