InvalidRequest Error for Attachments in Personal Microsoft Lists

Hello Community,

I’m experiencing a persistent issue with Microsoft Lists (personal account, accessed via web on Windows 11 using Microsoft Edge).

Problem:

All attachments in my personal Lists return the following error when clicked:
{"error":{"code":"invalidRequest","message":"Invalid request"}}

• This happens for both my oldest and recently uploaded attachments.
• This does NOT happen to NEW list items as of today and onwards
• I verified that attachments were successfully uploaded at the time, but now none are accessible.
  
  • Age of my uploads stretch from 2023 to this time
• Environment:
  
  • Windows 11 (fully updated)
  • Microsoft Edge (latest version)
  • Lists accessed via web (not the app)
  • Personal Microsoft account (not work/school)
  • No recent migration, rename, or permissions changes.

Steps Tried:

• Renamed the list (removed special character “ø” from the name).
• Uploaded new attachments
• Checked that both my sub-items are inaccessible (attachment and personal attachment fields used separately from item to item. No double uploads)
• Checked OneDrive and Recycle Bin — no attachments visible.
• No access to “Site contents” since this is a personal account.

Questions:

1. Is this a known issue with personal Lists attachments?
2. Are attachments stored in a hidden folder in OneDrive/SharePoint for personal accounts? If so, what is the usual path?
3. Is there any way to recover these attachments or fix the invalidRequest error?
   Impact:

I used Lists to manage and store receipts, and now all attachments appear broken. This is critical for my workflow.

Any guidance or escalation would be greatly appreciated!