Multiple conditions in cloud formation resource creation

Try adding

"MyCondition": {"Fn::Or": [{"Condition": "LinuxPlatform"}, {"Condition": "BothPlatform" }]}

to the bottom of your Conditions like that:

    "Conditions" : {
        "LinuxPlatform" : {"Fn::Equals" : [{"Ref" : "Platform"}, "linux"]},
        "WindowsPlatform" : {"Fn::Equals" : [{"Ref" : "Platform"}, "windows"]},
        "BothPlatform" : {"Fn::Equals" : [{"Ref" : "Platform"}, "both"]},
        "MyCondition": {"Fn::Or": [{"Condition": "LinuxPlatform"}, {"Condition": "BothPlatform" }]}
    },

I was looking for the same thing with different scenarios in the YAML format. Below is the YAML format for the reference.

CreateResources: !Or [!Equals [!Ref "Environment", prod], !Equals [!Ref "Environment", dev], !Equals [!Ref "Environment", preprod], !Equals [!Ref "Environment", test]]

example

---
AWSTemplateFormatVersion: 2010-09-09
Description: 'AWS cloudformation template bucket. '
Parameters:
  Environment:
    Description: Enter the environmet name from allowed values
    Type: String
    AllowedValues:
      - qa
      - dev
      - prod
      - stage
Conditions:
    Prod: !Equals [ !Ref Environment, production]
    dev: !Equals [ !Ref Environment, dev]
    stage: !Equals [ !Ref Environment, stage]
    qa: !Equals [ !Ref Environment, qa]
    CreateResources: !Or [!Equals [!Ref "Environment", prod], !Equals [!Ref "Environment", dev], !Equals [!Ref "Environment", preprod], !Equals [!Ref "Environment", test]]

Resources:
  RenderEngineEFSSG:
    Type: AWS::EC2::SecurityGroup
    Condition: CreateResources
    Properties:
      GroupDescription:  test SG. 
      GroupName: !Join [ "-", [ !Ref Environment, sgname ] ]
      VpcId: vpc-0e4d5cad992b8d65b
      SecurityGroupIngress:
        - IpProtocol: tcp
          FromPort: 2049
          ToPort: 2049
          CidrIp: 0.0.0.0/0
          Description: Ingress Rule for Lambda to access EFS.
      SecurityGroupEgress: []