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If you wan to add element in existing list - use nested joins:

ExternalBastionSecurityGroups - List<AWS::EC2::SecurityGroup::Id>
SecurityGroupsList            - List<AWS::EC2::SecurityGroup::Id>
Outputs.BastionSecurityGroup  - AWS::EC2::SecurityGroup::Id

SecurityGroupsList: !Join
  - ','
  - - !GetAtt [ securitygroups, Outputs.BastionSecurityGroup ]
    - !Join [ ',', !Ref ExternalBastionSecurityGroups ]

How to filter intalled on the host certificates by FriendlyName

@powershell "Get-ChildItem -Recurse Cert: | where { $_.FriendlyName -eq 'Starfield Class 2 Certification Authority' -or $_.FriendlyName -eq 'Starfield Services Root Certificate Authority - G2' -or $_.FriendlyName -eq 'Amazon Root CA 1'} | Format-Table -AutoSize | Out-String -Width 2000"

This IAM Role trust relationship configuration allow IAM User from another account to assume current role

{
"Version": "2012-10-17",
"Statement": [
{
"Effect": "Allow",
"Principal": {
"AWS": "arn:aws:iam::USER-ACCOUNT-ID:root"
},
"Action": "sts:AssumeRole",
"Condition": {
"StringEquals": {
"aws:username": "USER-NAME"
}
}
}
]
}

In case when SSL error occurred when you update gems (http://guides.rubygems.org/ssl-certificate-update/#installing-using-update-packages):

— download update manually rubygems.org
— install update from local file system:

gem install --local .\rubygems-update-2.6.11.gem
update_rubygems
gem uninstall rubygems-update -x