可以通过在AWS Cognito控制台中手动添加声明的映射来解决此问题，或者在AWS Lambda函数中使用AWS SDK实现自定义声明映射。以下是使用AWS SDK实现自定义声明映射的示例:

const AWS = require('aws-sdk');
const cognitoidentity = new AWS.CognitoIdentity();

exports.handler = async (event, context) => {
    const accessToken = event.accessToken;
    const identityId = event.identityId;

    const params = {
        IdentityId: identityId,
        Logins: {
            'LOGIN_PROVIDER_NAME': accessToken
        }
    };
    
    const {Credentials} = await cognitoidentity.getCredentialsForIdentity(params).promise();
    const { assumeRoleWithWebIdentity } = new AWS.STS();
    
    const roleArn = 'arn:aws:iam::ACCOUNT_ID:role/ROLE_NAME'; // Replace with actual role ARN
    const sessionName = 'MySession'; // Replace with any session name

    const assumeRoleParams = {
        RoleArn: roleArn,
        RoleSessionName: sessionName,
        WebIdentityToken: accessToken,
        DurationSeconds: 3600,
    };
    
    const { Credentials: WebIdentityCredentials } = await assumeRoleWithWebIdentity(assumeRoleParams).promise();
    
    // Add custom mapping logic for claims
    const customClaims = {
        'custom:Department': 'Marketing'
    };
    
    const {IdentityPoolId} = process.env;
    const { updateIdentityPool } = new AWS.CognitoIdentity({region: 'us-east-1'});
    
    const identityPoolParams = {
        AllowUnauthenticatedIdentities: false,
        IdentityPoolId: IdentityPoolId,
        IdentityProviderConfigs: [
            {
                ProviderName: "LOGIN_PROVIDER_NAME",
                ProviderDetails: {},
                AttributeMapping: {
                    "custom:Department": "department"
                }
            }
        ]
    };
    
    await updateIdentityPool(identityPoolParams).promise();
    
    return {
        statusCode: 200,
        body: JSON.stringify({
            Credentials,
            WebIdentityCredentials
        })
    };
};