Kubernetes: can't join on different subnet - TLS Bootstrap timeout - kubernetes

Question

I have two Ubuntu 18.04 Server machines on AWS (the network conf its okay, I'm able even to connect through SSH between them but they are on different subnets of the same LAN). Ubuntu firewall also disabled.
M1: 172.31.32.210/255.255.240.0 -> 172.31.32.0/20 
M2: 172.31.20.59/255.255.240.0 -> 172.31.16.0/20
The command I execute on the master:
sudo kubeadm init --pod-network-cidr=192.168.0.0/16 --apiserver-cert-extra-sans=17
2.31.32.210
# After that
mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config
I noticed that as they are on different subnets, I need to create a Calico node to able the communications between them: https://docs.projectcalico.org/getting-started/kubernetes/quickstart
After making all that, I introduce the kubeadm join command that return the init procudure, an the following message appears... No way to make the connection:
ubuntu#ip-175-31-20-59:~$ sudo kubeadm join 172.31.45.77:6443 --token yht6uv.zrynwczvad9ra5e4 --discovery-token-ca-cert-hash sha256:6f4f3e98067151768d1339b52159b5469cb83511ad6ea31dc26e15e8631074f6
[preflight] Running pre-flight checks
[preflight] Reading configuration from the cluster...
[preflight] FYI: You can look at this config file with 'kubectl -n kube-system get cm kubeadm-config -o yaml'
[kubelet-start] Writing kubelet configuration to file "/var/lib/kubelet/config.yaml"
[kubelet-start] Writing kubelet environment file with flags to file "/var/lib/kubelet/kubeadm-flags.env"
[kubelet-start] Starting the kubelet
[kubelet-start] Waiting for the kubelet to perform the TLS Bootstrap...
[kubelet-check] Initial timeout of 40s passed.
[kubelet-check] It seems like the kubelet isn't running or healthy.
[kubelet-check] The HTTP call equal to 'curl -sSL http://localhost:10248/healthz' failed with error: Get "http://localhost:10248/healthz": dial tcp 127.0.0.1:10248: connect: connection refused.
[kubelet-check] It seems like the kubelet isn't running or healthy.
[kubelet-check] The HTTP call equal to 'curl -sSL http://localhost:10248/healthz' failed with error: Get "http://localhost:10248/healthz": dial tcp 127.0.0.1:10248: connect: connection refused.
[kubelet-check] It seems like the kubelet isn't running or healthy.
[kubelet-check] The HTTP call equal to 'curl -sSL http://localhost:10248/healthz' failed with error: Get "http://localhost:10248/healthz": dial tcp 127.0.0.1:10248: connect: connection refused.
[kubelet-check] It seems like the kubelet isn't running or healthy.
[kubelet-check] The HTTP call equal to 'curl -sSL http://localhost:10248/healthz' failed with error: Get "http://localhost:10248/healthz": dial tcp 127.0.0.1:10248: connect: connection refused.
[kubelet-check] It seems like the kubelet isn't running or healthy.
[kubelet-check] The HTTP call equal to 'curl -sSL http://localhost:10248/healthz' failed with error: Get "http://localhost:10248/healthz": dial tcp 127.0.0.1:10248: connect: connection refused.
error execution phase kubelet-start: error uploading crisocket: timed out waiting for the condition
To see the stack trace of this error execute with --v=5 or higher
I have followed many tutorials (this or this for example), but I always find the same problem, the TLS Bootstrap when I make the join command on the worker. Any idea?