S3临时URL突然无法访问（Laravel环境）求助排查

我通过Laravel控制器生成S3存储文件的临时URL供用户临时访问，代码如下：

return Storage::disk('s3')->temporaryUrl('Reports/report_signed2.pdf', now()->addMinutes(1));

此前S3存储配置正常且功能可用，但近期生成的URL返回“Access Denied”（访问被拒绝）。我未修改过IAM策略，怀疑是否AWS S3安全规则更新导致需要调整存储桶或IAM设置？

我的IAM包含三个策略： #

1. AmazonS3FullAccess #

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Effect": "Allow",
            "Action": [
                "s3:*",
                "s3-object-lambda:*"
            ],
            "Resource": "*"
        }
    ]
}

2. iaminlinepolicy #

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Effect": "Allow",
            "Action": [
                "s3:ListBucket",
                "s3:GetObject",
                "s3:DeleteObject",
                "s3:GetObjectAcl",
                "s3:PutObjectAcl",
                "s3:PutObject",
                "s3:GetAccessGrants"
            ],
            "Resource": [
                "arn:aws:s3:::hris-pangasinan",
                "arn:aws:s3:::hris-pangasinan/*"
            ]
        }
    ]
}

3. laravel-policy #

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Effect": "Allow",
            "Action": [
                "s3:ListBucket",
                "s3:GetObject",
                "s3:DeleteObject",
                "s3:GetObjectAcl",
                "s3:PutObjectAcl",
                "s3:PutObject",
                "s3:GetAccessGrants"
            ],
            "Resource": [
                "arn:aws:s3:::hris-pangasinan",
                "arn:aws:s3:::hris-pangasinan/*"
            ]
        }
    ]
}

我已尝试排查但未解决问题，恳请协助。

内容的提问来源于stack exchange，提问作者Allan Posadas