Unable to upload logo image to app registration

[alexdrenea]

This is autogenerated. Please review and update as needed.

Describe the bug

Trying to upload the logo for an Azure app Registration, running into an encoding issue with az rest. (See below)

Command Name
az rest

Errors:

The command failed with an unexpected error. Here is the traceback:
'latin-1' codec can't encode character '\u2030' in position 0: Body ('‰') is not valid Latin-1. Use body.encode('utf-8') if you want to send it encoded in UTF-8.
Traceback (most recent call last):
  File "D:\a\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\knack/cli.py", line 231, in invoke
  File "D:\a\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/core/commands/__init__.py", line 663, in execute
  File "D:\a\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/core/commands/__init__.py", line 726, in _run_jobs_serially
  File "D:\a\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/core/commands/__init__.py", line 697, in _run_job
  File "D:\a\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/core/commands/__init__.py", line 333, in __call__
  File "D:\a\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/core/commands/command_operation.py", line 121, in handler
  File "D:\a\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/command_modules/util/custom.py", line 24, in rest_call
  File "D:\a\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/core/util.py", line 974, in send_raw_request
  File "D:\a\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\requests/sessions.py", line 655, in send
  File "D:\a\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\requests/adapters.py", line 439, in send
  File "D:\a\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\urllib3/connectionpool.py", line 699, in urlopen
  File "D:\a\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\urllib3/connectionpool.py", line 394, in _make_request
  File "D:\a\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\urllib3/connection.py", line 239, in request
  File "http\client.py", line 1282, in request
  File "http\client.py", line 1327, in _send_request
  File "http\client.py", line 166, in _encode
UnicodeEncodeError: 'latin-1' codec can't encode character '\u2030' in position 0: Body ('‰') is not valid Latin-1. Use body.encode('utf-8') if you want to send it encoded in UTF-8.

To Reproduce:

Steps to reproduce the behavior. Note that argument values have been redacted, as they may contain sensitive information.

• Put any pre-requisite steps here...
• $logoBytes = Get-Content ..\logo.png -Raw
• az rest --method PUT --uri "https://graph.microsoft.com/v1.0/applications/$MYAPPID/logo" --headers 'Content-Type=image/png' --body $logoBytes

Expected Behavior

Environment Summary

Windows-10-10.0.22621-SP0
Python 3.10.4
Installer: MSI

azure-cli 2.37.0 *

Extensions:
account 0.2.1
application-insights 0.1.16
containerapp 0.3.7
storage-preview 0.8.3

Dependencies:
msal 1.18.0b1
azure-mgmt-resource 21.1.0b1

Additional Context

[yonzhan]

@jiasli for awareness

[alexdrenea]

The error above might be due to improper encoding of the stream being sent in.
After correcting the encoding (was not sending the body as stream), encountering a new error:

Script errors out with message "The command line is too long."

$logoBytesWeb = (Invoke-WebRequest "https://purepng.com/public/uploads/medium/purepng.com-microsoft-logo-iconlogobrand-logoiconslogos-251519939091wummo.png").Content
az rest --method PUT --uri "https://graph.microsoft.com/v1.0/applications/$appId/logo" --headers 'Content-Type=image/png' --body $logoBytesWeb --debug                                                                                                                                        

I am now confident I am now sending the proper bytes stream since I can make this work using the Invoke-RestMehod in PowerShell

Script that works:

$token=(az account get-access-token --resource "https://graph.microsoft.com" --query accessToken --output tsv)

$logoBytesWeb = (Invoke-WebRequest "https://purepng.com/public/uploads/medium/purepng.com-microsoft-logo-iconlogobrand-logoiconslogos-251519939091wummo.png").Content

Invoke-RestMethod -Uri "https://graph.microsoft.com/v1.0/applications/$appId/logo" -Method "PUT" -Header @{"Authorization"="Bearer $token";"Content-Type"="image/png";} -Body $logoBytesWeb

[gabbsmo]

I also ran into this issue. I tried the following two approaches:

$bytes = $bytes = [System.IO.File]::ReadAllBytes($logo)
az rest `
  --method "put" `
  --uri "https://graph.microsoft.com/beta/applications/$($app.id)/logo" `
  --headers "{'Content-Type': 'image/png'}" `
  --body "$bytes"

# ERROR:  
# Program 'az.cmd' failed to run: An error occurred trying to start process 'C:\Program Files\Microsoft SDKs\Azure\CLI2\wbin\az.cmd' with working directory 'C:\git\metashare\Azure'. The filename or extension is too long.

az rest `
  --method "put" `
  --uri "https://graph.microsoft.com/beta/applications/$($app.id)/logo" `
  --headers "{'Content-Type': 'image/png'}" `
  --body "@$logo"

# ERROR:
# Bad Request({"error":{"code":"Request_BadRequest","message":"Stream content does not represent a valid image.","innerError":{"date":"2026-03-09T07:12:52","request-id":"b946bd99-dec3-4204-9ac6-0adddb09f76b","client-request-id":"b946bd99-dec3-4204-9ac6-0adddb09f76b"}}})

As a workaround I can use Invoke-RestMethod but a native way to send files via az rest would be a useful escape hatch for this and possible other cases when native az commands are not available.