Thanks again for your help.

I paste you the.ovpn file that I have in case you would see an important error knowing that the file works perfectly with all the devices. (I just deleted the certificate and IP ;-)))

Many thanks in advance

client
nobind
dev tun
redirect-gateway def1
<key>
-----BEGIN PRIVATE KEY-----
The certificate
-----END PRIVATE KEY-----
</key>
<cert>
Certificate:
    Data:
        Version: 3 (0x2)
        Serial Number: 2 (0x2)
    Signature Algorithm: sha256WithRSAEncryption
        Issuer: C=US, ST=CA, L=SanFrancisco, O=Fort-Funston, OU=MyOrganizationalUnit, CN=Fort-Funston CA/name=EasyRSA/emailAddress=me@myhost.mydomain
        Validity
            Not Before: Sep  6 09:58:48 2017 GMT
            Not After : Sep  4 09:58:48 2027 GMT
        Subject: C=US, ST=CA, L=SanFrancisco, O=Fort-Funston, OU=MyOrganizationalUnit, CN=jcpuech/name=EasyRSA/emailAddress=me@myhost.mydomain
        Subject Public Key Info:
            Public Key Algorithm: rsaEncryption
                Public-Key: (2048 bit)
                Modulus:
                    The Modulus
                Exponent: 65537 (0x10001)
        X509v3 extensions:
            X509v3 Basic Constraints: 
                CA:FALSE
            Netscape Comment: 
                Easy-RSA Generated Certificate
            X509v3 Subject Key Identifier: 
                The Key idendifier
            X509v3 Authority Key Identifier: 
                keyid: The Key ID
                DirName:/C=US/ST=CA/L=SanFrancisco/O=Fort-Funston/OU=MyOrganizationalUnit/CN=Fort-Funston CA/name=EasyRSA/emailAddress=me@myhost.mydomain
                serial: The Serial number

            X509v3 Extended Key Usage: 
                TLS Web Client Authentication
            X509v3 Key Usage: 
                Digital Signature
            X509v3 Subject Alternative Name: 
                DNS:jcpuech
    Signature Algorithm: sha256WithRSAEncryption
         The signature
-----BEGIN CERTIFICATE-----
The certificate
-----END CERTIFICATE-----
</cert>
<ca>
-----BEGIN CERTIFICATE-----
The certificate
-----END CERTIFICATE-----
</ca>
<dh>
-----BEGIN DH PARAMETERS-----
The DH parameters
-----END DH PARAMETERS-----
</dh>

# hardening
remote-cert-tls server

tls-version-min 1.2

cipher AES-256-CBC
auth SHA256

key-direction 1
<tls-auth>
#
# 2048 bit OpenVPN static key
#
-----BEGIN OpenVPN Static key V1-----
The Static key V1
-----END OpenVPN Static key V1-----
</tls-auth>
<connection>
  remote XXX.XXX.XXX.XX 1194 udp
</connection>
<connection>
  remote XXX.XXX.XXX.XX 443 tcp-client
</connection>