ERROR! Specified hosts and/or --limit does not match any hosts

Duas possibilidades para correção do erro:

adicione o parâmetro ansible.limit = "all";

faça o inventário dinâmico. Ex:

Vagrant.configure("2") do |config|

 config.vm.box = "ubuntu/bionic64"
 config.vm.synced_folder "./configs", "/configs"
 config.vm.synced_folder ".", "/vagrant",
     disabled: true

 config.vm.define "mysqldb" do |mysql|
     mysql.vm.network "public_network",
         ip: "10.10.100.21", bridge: "wlp3s0"
 end

 config.vm.define "mysql" do |mysql2|
     mysql2.vm.network "public_network",
         ip: "10.10.100.22", bridge: "wlp3s0"
 end

 config.vm.provision :ansible do |ansible|
     ansible.playbook = "./configs/ansible/playbook.yml"
     ansible.groups = {
         "mysqlserver" => ["mysql", "mysqldb"]
     }
 end

end