[SOLVED] Self-Signed CA Certificates Rejected by Android

I'm using the following script to create certificates using my own internal CA(Work in progress):

#!/bin/bash
while [[ "$#" < 1 ]];do
  echo "Usage: cert-admin.sh [COMMAND] [OPTIONS]\n"
  echo "  Commands:"
  echo "    newpair   - Creates a key and signed certificate"
  echo "    revoke    - Revokes a certificate and re-creates the intermediate CRL"
  echo "    newcrl    - Re-creates the intermediate CRL"
  echo ""
  echo "  Examples: cert-admin.sh newpair server example.mysite.com"
  echo "            cert-admin.sh revoke example.mysite.com"
  echo ""
  echo "  Types: server"
  exit 1
done
command=$1
function newCRL {
  cd /root/ca
  rm -f intermediate/crl/intermediate.crl.pem
  openssl ca -config intermediate/openssl.cnf \
      -gencrl -out intermediate/crl/intermediate.crl.pem
  openssl crl -in intermediate/crl/intermediate.crl.pem -noout -text
}
while [[ $command == 'newpair' ]];do
  type=$2
  fqdn=$3
  while [[ $type == 'server' ]];do
    cd /root/ca
    openssl genrsa -out intermediate/private/$fqdn.key.pem 2048
    openssl req -reqexts SAN \
      -config <(cat intermediate/openssl.cnf \
        <(printf "\n[SAN]\nsubjectAltName=DNS:$fqdn\n\n")) \
      -key intermediate/private/$fqdn.key.pem \
      -new -sha256 -out intermediate/csr/$fqdn.csr.pem
    openssl ca -config intermediate/openssl.cnf \
      -extensions server_cert -days 375 -notext -md sha256 \
      -in intermediate/csr/$fqdn.csr.pem \
      -out intermediate/certs/$fqdn.cert.pem
    chmod 444 intermediate/private/$fqdn.key.pem
    chmod 444 intermediate/certs/$fqdn.cert.pem
    openssl x509 -noout -text \
      -in intermediate/certs/$fqdn.cert.pem
    openssl verify -CAfile intermediate/certs/ca-chain.cert.pem \
      intermediate/certs/$fqdn.cert.pem
    echo "ca-chain:  /root/ca/intermediate/certs/ca-chain.cert.pem"
    echo "key:        /root/ca/intermediate/private/$fqdn.key.pem"
    echo "cert:       /root/ca/intermediate/certs/$fqdn.cert.pem"
    break;
  done
  break;
done
while [[ $command == 'revoke' ]];do
  cert=$2
  cd /root/ca
  openssl ca -config intermediate/openssl.cnf \
      -revoke intermediate/certs/$cert.cert.pem
  newCRL
  break;
done
while [[ $command == 'newcrl' ]];do
  newCRL
    while [[ $2 != 'cron' ]];do
    echo "CRL should be re-created by cron every 30 days. Example:"
    echo "30 12 2 * * /root/ca/cert-admin.sh newcrl cron"
    break;
  done
  break;
done

intermediate/openssl.cnf


[ ca ]
default_ca = CA_default

[ CA_default ]
dir               = /root/ca/intermediate
certs             = $dir/certs
crl_dir           = $dir/crl
new_certs_dir     = $dir/newcerts
database          = $dir/index.txt
serial            = $dir/serial
RANDFILE          = $dir/private/.rand

private_key       = $dir/private/intermediate.key.pem
certificate       = $dir/certs/intermediate.cert.pem

crlnumber         = $dir/crlnumber
crl               = $dir/crl/intermediate.crl.pem
crl_extensions    = crl_ext
default_crl_days  = 30

default_md        = sha256

name_opt          = ca_default
cert_opt          = ca_default
default_days      = 375
preserve          = no
policy            = policy_loose

[ policy_strict ]
countryName             = match
stateOrProvinceName     = match
organizationName        = match
organizationalUnitName  = optional
commonName              = supplied
emailAddress            = optional

[ policy_loose ]
countryName             = optional
stateOrProvinceName     = optional
localityName            = optional
organizationName        = optional
organizationalUnitName  = optional
commonName              = supplied
emailAddress            = optional

[ req ]
default_bits        = 4096
distinguished_name  = req_distinguished_name
string_mask         = utf8only

default_md          = sha256

x509_extensions     = v3_ca

[ req_distinguished_name ]
countryName                     = Country Name (2 letter code)
stateOrProvinceName             = State or Province Name
localityName                    = Locality Name
0.organizationName              = Organization Name
organizationalUnitName          = Organizational Unit Name
commonName                      = Common Name
emailAddress                    = Email Address

countryName_default             = US
stateOrProvinceName_default     = Denial
localityName_default            = Springfield
0.organizationName_default      = MyOrg
organizationalUnitName_default  = Research
emailAddress_default            = mail@example.com

[ v3_ca ]
subjectKeyIdentifier = hash
authorityKeyIdentifier = keyid:always,issuer
basicConstraints = critical, CA:true
keyUsage = critical, digitalSignature, cRLSign, keyCertSign

[ v3_intermediate_ca ]
subjectKeyIdentifier = hash
authorityKeyIdentifier = keyid:always,issuer
basicConstraints = critical, CA:true, pathlen:0
keyUsage = critical, digitalSignature, cRLSign, keyCertSign

[ usr_cert ]
basicConstraints = CA:FALSE
nsCertType = client, email
nsComment = "OpenSSL Generated Client Certificate"
subjectKeyIdentifier = hash
authorityKeyIdentifier = keyid,issuer
keyUsage = critical, nonRepudiation, digitalSignature, keyEncipherment
extendedKeyUsage = clientAuth, emailProtection

[ server_cert ]
basicConstraints = CA:FALSE
nsCertType = server
nsComment = "OpenSSL Generated Server Certificate"
subjectKeyIdentifier = hash
authorityKeyIdentifier = keyid,issuer:always
keyUsage = critical, digitalSignature, keyEncipherment
extendedKeyUsage = serverAuth

[ crl_ext ]
authorityKeyIdentifier=keyid:always

[ ocsp ]
basicConstraints = CA:FALSE
subjectKeyIdentifier = hash
authorityKeyIdentifier = keyid,issuer
keyUsage = critical, digitalSignature
extendedKeyUsage = critical, OCSPSigning

With the intermediate CA trusted in Arch Linux, the certificate doesn't throw any errors.

However, on Android I get errors. I think it has something to do with SAN as the Bitwarden Android app shows subjectAltNames[] and Kiwi browser(Chrome Desktop for Android) shows ERR_CERT_COMMON_NAME_INVALID.

Using -addext "subjectAltName = DNS:www.example.com" with -config intermediate/openssl.cnf doesn't work either.

Creating a self signed cert using:

openssl req -new -newkey rsa:4096 -days 365 -nodes -x509 \
-addext "subjectAltName = DNS:www.example.com" \
-subj "/C=US/ST=Denial/L=Springfield/O=MyOrg/CN=www.example.com" \
-keyout web.key  -out web.crt

works fine.

EDIT: Common Name is set to the FQDN when prompted.

EDIT2: To clarify, this is after installing the CA chain cert on the Android device. Running Android 10.

EDIT3: I've narrowed the issue down to SAN not being added due to -config <(cat intermediate/openssl.cnf <(printf "\n[SAN]\nsubjectAltName=DNS:$fqdn\n\n")) not working. Is there another way to include SAN while specifying openssl.cnf? It's not working for me...