This is the new *Amazon CloudFormation Template Reference Guide*. Please update your bookmarks and links. For help getting started with CloudFormation, see the [Amazon CloudFormation User Guide](https://docs.amazonaws.cn/AWSCloudFormation/latest/UserGuide/Welcome.html).

# AWS::IdentityStore::GroupMembership MemberId
<a name="aws-properties-identitystore-groupmembership-memberid"></a>

An object that contains the identifier of a group member. Setting the `UserID` field to the specific identifier for a user indicates that the user is a member of the group.

## Syntax
<a name="aws-properties-identitystore-groupmembership-memberid-syntax"></a>

To declare this entity in your Amazon CloudFormation template, use the following syntax:

### JSON
<a name="aws-properties-identitystore-groupmembership-memberid-syntax.json"></a>

```
{
  "[UserId](#cfn-identitystore-groupmembership-memberid-userid)" : String
}
```

### YAML
<a name="aws-properties-identitystore-groupmembership-memberid-syntax.yaml"></a>

```
  [UserId](#cfn-identitystore-groupmembership-memberid-userid): String
```

## Properties
<a name="aws-properties-identitystore-groupmembership-memberid-properties"></a>

`UserId`  <a name="cfn-identitystore-groupmembership-memberid-userid"></a>
An object containing the identifiers of resources that can be members.  
*Required*: Yes  
*Type*: String  
*Pattern*: `^([0-9a-f]{10}-|)[A-Fa-f0-9]{8}-[A-Fa-f0-9]{4}-[A-Fa-f0-9]{4}-[A-Fa-f0-9]{4}-[A-Fa-f0-9]{12}$`  
*Minimum*: `1`  
*Maximum*: `47`  
*Update requires*: [Replacement](https://docs.amazonaws.cn/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-replacement)