[BUG] Teams notification response: Webhook message delivery failed with error: Microsoft Teams endpoint returned HTTP error 400 with ContextId 01=2. #125

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Windows PowerShell transcript start
Start time: 20250920120511
Username: DOMAIN\SYSTEM
RunAs User: DOMAIN\SYSTEM
Configuration Name: 
Machine: WIN2022 (Microsoft Windows NT 10.0.20348.0)
Host Application: C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe -NoProfile -ExecutionPolicy Bypass -File C:\VeeamScripts\VeeamNotify\Bootstrap.ps1
Process ID: 17760
PSVersion: 5.1.20348.4163
PSEdition: Desktop
PSCompatibleVersions: 1.0, 2.0, 3.0, 4.0, 5.0, 5.1.20348.4163
BuildVersion: 10.0.20348.4163
CLRVersion: 4.0.30319.42000
WSManStackVersion: 3.0
PSRemotingProtocolVersion: 2.3
SerializationVersion: 1.1.0.1
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2025-09-20T02:05:11.321Z [INFO] Transcript is being logged to 'C:\VeeamScripts\VeeamNotify\log\2025-09-20_12.05.11_Bootstrap.log'.
2025-09-20T02:05:11.417Z [INFO] Version: v2.1.1
2025-09-20T02:05:11.734Z [INFO] Configuration validated successfully.
2025-09-20T02:05:11.750Z [INFO] Attempting to retrieve job ID and session ID from the parent process.
2025-09-20T02:05:11.924Z [INFO] Getting VBR job details
2025-09-20T02:05:16.733Z [INFO] Getting VBR session information
2025-09-20T02:05:16.883Z [INFO] Bootstrap script for Veeam job 'VWLC-VWLC2_clone1 (Incremental)' (job 015859d9-cb36-4b96-9672-7c9055d4d2cf session 26c380c4-93c6-439c-be0c-30cf929dd354) - Session & job detection complete.
2025-09-20T02:05:16.914Z [INFO] Launching AlertSender.ps1...
2025-09-20T02:05:16.955Z [INFO] AlertSender.ps1 launched successfully.
2025-09-20T02:05:16.987Z [INFO] Stopping transcript logging.
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Windows PowerShell transcript end
End time: 20250920120516
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Windows PowerShell transcript start
Start time: 20250920120520
Username: DOMAIN\SYSTEM
RunAs User: DOMAIN\SYSTEM
Configuration Name: 
Machine: WIN2022 (Microsoft Windows NT 10.0.20348.0)
Host Application: C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe -NoProfile -File C:\VeeamScripts\VeeamNotify\AlertSender.ps1 -JobId 015859d9-cb36-4b96-9672-7c9055d4d2cf -SessionId 26c380c4-93c6-439c-be0c-30cf929dd354 -JobType Backup -Config {
  "services": {
           "discord": {
                   "enabled": false,
                   "webhook": "DiscordWebhook",
                   "user_id": "123456789"
                 },
           "slack": {
                  "enabled": false,
                  "webhook": "SlackWebhook",
                  "user_id": "A1B2C3D4E5"
                },
           "teams": {
                  "enabled": true,
                  "webhook": "https://domain.webhook.office.com/webhookb2/...",
                  "user_id": "user@domain.com",
                  "display_name": "firstname surname"
                },
           "telegram": {
                   "enabled": false,
                   "bot_token": "TelegramBotToken",
                   "chat_id": "TelegramChatID",
                   "user_name": "yourusername"
                 },
           "http": {
                 "enabled": false,
                 "url": "EndpointURL",
                 "method": "POST"
               }
         },
  "mentions": {
           "on_failure": true,
           "on_warning": true,
           "on_success": true
         },
  "notifications": {
             "on_success": true,
             "on_failure": true,
             "on_warning": true
           },
  "logging": {
          "enabled": true,
          "level": "debug",
          "max_age_days": 7
        },
  "update": {
          "notify": true,
          "auto_update": false,
          "auto_update_comment": "auto_update is not yet implemented. This will do nothing even if \u0027true\u0027."
        },
  "thumbnail": "https://raw.githubusercontent.com/tigattack/VeeamNotify/main/asset/thumb01.png"
}
 -Logfile C:\VeeamScripts\VeeamNotify\log\2025-09-20_12.05.11-VWLC-VWLC2_clone1_(Incremental).log
Process ID: 8480
PSVersion: 5.1.20348.4163
PSEdition: Desktop
PSCompatibleVersions: 1.0, 2.0, 3.0, 4.0, 5.0, 5.1.20348.4163
BuildVersion: 10.0.20348.4163
CLRVersion: 4.0.30319.42000
WSManStackVersion: 3.0
PSRemotingProtocolVersion: 2.3
SerializationVersion: 1.1.0.1
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2025-09-20T02:05:20.549Z [INFO] Transcript is being logged to 'C:\VeeamScripts\VeeamNotify\log\2025-09-20_12.05.11-VWLC-VWLC2_clone1_(Incremental).log'.
2025-09-20T02:05:26.275Z [INFO] No update available.
2025-09-20T02:05:26.305Z [DEBUG] Skipping Discord notification as it is not enabled.
2025-09-20T02:05:26.305Z [DEBUG] Skipping Slack notification as it is not enabled.
2025-09-20T02:05:28.867Z [INFO] Teams notification sent successfully.
2025-09-20T02:05:28.867Z [DEBUG] Teams notification response: Webhook message delivery failed with error: Microsoft Teams endpoint returned HTTP error 400 with ContextId 01=2..
2025-09-20T02:05:28.867Z [DEBUG] Skipping Telegram notification as it is not enabled.
2025-09-20T02:05:28.867Z [DEBUG] Skipping Http notification as it is not enabled.
2025-09-20T02:05:28.867Z [DEBUG] Running log cleanup.
VERBOSE: Performing the operation "Remove expired log files" on target "C:\VeeamScripts\VeeamNotify\log".
2025-09-20T02:05:28.898Z [DEBUG] Searching for log files older than 7 days.
2025-09-20T02:05:28.914Z [DEBUG] Found 0 logs files exceeding retention period.
2025-09-20T02:05:28.914Z [INFO] Stopping transcript logging.
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End time: 20250920120528
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