我原本以为这个问题是由于区域不匹配造成的，但是在更改区域后，我在尝试此处找到的 Amazon AWS 示例时仍然遇到以下错误：
AmazonServiceException: User: arn:aws:sts::[My Account
ARN]:assumed-role/Cognito_AndroidAppUnauth_DefaultRole/ProviderSession
is not authorized to perform: dynamodb:DescribeTable on resource:
arn:aws:dynamodb:us-east-1:[My Account ARN]:table/test_table (Service:
AmazonDynamoDBv2; Status Code: 400; Error Code: AccessDeniedException;
Request ID: BBFTS0Q8UHTMG120IORC2KSASVVV4KQNSO5AEMVJF66Q9ASUAAJG)
一切都或多或少相同，我唯一更改的是将DBclient区域更改US_EAST_1为托管我的测试表的区域，并使用通过以下生成的“Amazon Cognito Starter Code”页面中的信息修改常量文件Cognito 入门文档。
对于我的Cognito_AndroidAppUnauth_DefaultRole角色策略，我修改了默认的移动分析和同步服务权限，以包括对所有表的所有操作的访问，无论是否存在：
{
"Version": "2012-10-17",
"Statement": [
{
"Sid": "CognitoPolicy",
"Action": [
"mobileanalytics:PutEvents",
"cognito-sync:*"
],
"Effect": "Allow",
"Resource": [
"*"
]
},
{
"Sid": "DynamoDBPolicy",
"Effect": "Allow",
"Action": [
"dynamodb: *"
],
"Resource": "*"
}
]
}
那么为什么在使用正确的区域并且 Unauth 策略应该允许表访问时声称它没有权限呢？
编辑：调用 DynamoDB 资源（创建表）上的方法时的 Stacktrace，它是否有用
com.amazonaws.AmazonServiceException: User: arn:aws:sts::[My Account ARN]:assumed-role/Cognito_AndroidAppUnauth_DefaultRole/ProviderSession is not authorized to perform: dynamodb:CreateTable on resource: arn:aws:dynamodb:us-east-1:[My Account ARN]:table/test_table (Service: AmazonDynamoDBv2; Status Code: 400; Error Code: AccessDeniedException; Request ID: SDELNSMLO10EV7CM2STC1R9RU3VV4KQNSO5AEMVJF66Q9ASUAAJG)
at com.amazonaws.http.AmazonHttpClient.handleErrorResponse(Unknown Source)
at com.amazonaws.http.AmazonHttpClient.executeHelper(Unknown Source)
at com.amazonaws.http.AmazonHttpClient.execute(Unknown Source)
at com.amazonaws.services.dynamodbv2.AmazonDynamoDBClient.invoke(Unknown Source)
at com.amazonaws.services.dynamodbv2.AmazonDynamoDBClient.createTable(Unknown Source)
at com.amazonaws.demo.userpreferencesom.DynamoDBManager.createTable(DynamoDBManager.java:72)
at com.amazonaws.demo.userpreferencesom.UserPreferenceDemoActivity$DynamoDBManagerTask.doInBackground(UserPreferenceDemoActivity.java:99)
at com.amazonaws.demo.userpreferencesom.UserPreferenceDemoActivity$DynamoDBManagerTask.doInBackground(UserPreferenceDemoActivity.java:85)
at android.os.AsyncTask$2.call(AsyncTask.java:288)
at java.util.concurrent.FutureTask.run(FutureTask.java:237)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
at java.lang.Thread.run(Thread.java:841)
