reset resource policy of CloudWatch logs, see doc https://docs.aws.amazon.com/AmazonCloudWatch/latest/logs/AWS-logs-and-resource-policy.html#AWS-logs-infrastructure-CWL

reset.sh

aws logs put-resource-policy --policy-name AWSLogDeliveryWrite20150319 \
--policy-document '
{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Sid": "AWSLogDeliveryWrite",
      "Effect": "Allow",
      "Principal": {
        "Service": "delivery.logs.amazonaws.com"
      },
      "Action": [
        "logs:CreateLogStream",
        "logs:PutLogEvents"
      ],
      "Resource": []
    },
    {
      "Sid": "AWSLogDeliveryWrite2",
      "Effect": "Allow",
      "Principal": {
        "Service": "delivery.logs.amazonaws.com"
      },
      "Action": [
        "logs:CreateLogStream",
        "logs:PutLogEvents"
      ],
      "Resource": [
      ],
      "Condition": {
        "StringEquals": {
          "aws:SourceAccount": "845861764576"
        },
        "ArnLike": {
          "aws:SourceArn": "arn:aws:logs:us-east-1:845861764576:*"
        }
      }
    }
  ]
}
'