Error No IMDS credentials found on instance.failed to run commands: exit status 156

Question

I'm trying to automate Patching on Ubuntu 20.04 EC2 instances with Patch Manager and I'm getting this error while trying to execute AWS-QuickSetup-PatchPolicy-ScanForPatches:
**No IMDS credentials found on instance.failed to run commands: exit status 156**

Output log:
```
/usr/bin/python3

/usr/bin/apt-get

Reading package lists...

Building dependency tree...

Reading state information...

Suggested packages:

python3-apt-dbg python-apt-doc

The following packages will be upgraded:

python3-apt

1 upgraded, 0 newly installed, 0 to remove and 98 not upgraded.

Need to get 154 kB of archives.

After this operation, 0 B of additional disk space will be used.

Get:1 http://eu-central-1.ec2.archive.ubuntu.com/ubuntu focal-updates/main amd64 python3-apt amd64 2.0.1ubuntu0.20.04.1 [154 kB]

Fetched 154 kB in 0s (7140 kB/s)

(Reading database ... (Reading database ... 5% (Reading database ... 10% (Reading database ... 15% (Reading database ... 20% (Reading database ... 25% (Reading database ... 30% (Reading database ... 35% (Reading database ... 40% (Reading database ... 45% (Reading database ... 50% (Reading database ... 55% (Reading database ... 60% (Reading database ... 65% (Reading database ... 70% (Reading database ... 75% (Reading database ... 80% (Reading database ... 85% (Reading database ... 90% (Reading database ... 95% (Reading database ... 100% (Reading database ... 66481 files and directories currently installed.)

Preparing to unpack .../python3-apt_2.0.1ubuntu0.20.04.1_amd64.deb ...

Unpacking python3-apt (2.0.1ubuntu0.20.04.1) over (2.0.0ubuntu0.20.04.8) ...

Setting up python3-apt (2.0.1ubuntu0.20.04.1) ...

Using python binary: 'python3'

Using Python Version: Python 3.8.10

05/24/2023 10:25:31 root [INFO]: Downloading payload from https://s3.dualstack.eu-central-1.amazonaws.com/aws-ssm-eu-central-1/patchbaselineoperations/linux/payloads/patch-baseline-operations-1.108.tar.gz

05/24/2023 10:25:31 root [INFO]: Attempting to import entrance file os_selector

05/24/2023 10:25:32 root [INFO]: Running with snapshot id = and operation = Scan

05/24/2023 10:25:32 root [INFO]: Downloading Baseline Override from s3://aws-quicksetup-patchpolicy-012881927014-b0p5g/baseline_overrides.json

05/24/2023 10:25:32 root [ERROR]: Unable to download file from S3: s3://aws-quicksetup-patchpolicy-012881927014-b0p5g/baseline_overrides.json.

05/24/2023 10:25:32 root [ERROR]: Error loading entrance module.

Traceback (most recent call last):

File "/var/log/amazon/ssm/patch-baseline-operations/common_startup_entrance.py", line 203, in execute

exit( entrance_module.execute(*argv))

File "/var/log/amazon/ssm/patch-baseline-operations/os_selector.py", line 54, in execute

common_os_selector_methods.fetch_snapshot(operation_type, instance_id, region, reboot_option, document_step,

File "/var/log/amazon/ssm/patch-baseline-operations/common_os_selector_methods.py", line 279, in fetch_snapshot

baseline_override_dict = load_baseline_override(instance_id, baseline_override, document_step, region)

File "/var/log/amazon/ssm/patch-baseline-operations/patch_common/baseline_override.py", line 29, in load_baseline_override

baseline_overrides = _download_baseline_override_content(instance_id, baseline_override_path, region)

File "/var/log/amazon/ssm/patch-baseline-operations/patch_common/baseline_override.py", line 97, in _download_baseline_override_content

if download_file(instance_id, baseline_override_path, file_name, region):

File "/var/log/amazon/ssm/patch-baseline-operations/patch_common/downloader.py", line 56, in download_file

downloaded = download_from_s3(instance_id, remote_path, local_file_path, region)

File "/var/log/amazon/ssm/patch-baseline-operations/patch_common/downloader.py", line 35, in download_from_s3

s3_client.download_file(result.group(1), result.group(2), file_path)

File "/var/log/amazon/ssm/patch-baseline-operations/boto3/s3/inject.py", line 170, in download_file

return transfer.download_file(

File "/var/log/amazon/ssm/patch-baseline-operations/boto3/s3/transfer.py", line 307, in download_file

future.result()

File "/var/log/amazon/ssm/patch-baseline-operations/s3transfer/futures.py", line 106, in result

return self._coordinator.result()

File "/var/log/amazon/ssm/patch-baseline-operations/s3transfer/futures.py", line 265, in result

raise self._exception

File "/var/log/amazon/ssm/patch-baseline-operations/s3transfer/tasks.py", line 255, in _main

self._submit(transfer_future=transfer_future, **kwargs)

File "/var/log/amazon/ssm/patch-baseline-operations/s3transfer/download.py", line 342, in _submit

response = client.head_object(

File "/var/log/amazon/ssm/patch-baseline-operations/botocore/client.py", line 276, in _api_call

return self._make_api_call(operation_name, kwargs)

File "/var/log/amazon/ssm/patch-baseline-operations/botocore/client.py", line 586, in _make_api_call

raise error_class(parsed_response, operation_name)

botocore.exceptions.ClientError: An error occurred (404) when calling the HeadObject operation: Not Found

05/24/2023 10:25:32 root [ERROR]: An error occurred (404) when calling the HeadObject operation: Not Found