How to fix an issue of part of a steam game being blocked

Question

How to fix an issue of part of a steam game being blocked

Winston Falkenstein 0

Hello,

I received a message saying part of my Steam game, Master Duel, was blocked because it was unable to determine which profile I was using. I clicked the notification away but I believe it was in the C: Drive. I currently have two Master Duel profiles between two steam accounts. Is there a way to reverse this? I am unable to get into the game and I believe the blocked files are preventing a complete connection to the servers.

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2 answers

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Answer 1

Hendrix-V 17,965 Microsoft External Staff Moderator

Hi Winston Falkenstein,

Based on your description, it sounds like Windows may have blocked or quarantined a game-related file, which can sometimes prevent Steam games from launching or connecting properly. Since the exact notification was dismissed, the quickest approach is to check whether any Master Duel files were blocked and restore them if necessary.

Please try these checking steps:

1, Check Windows Security Protection History

Open Windows Security > Virus & threat protection.
Select Protection history.
Look for any entries related to Steam or Master Duel.
If a game file was blocked and you recognize it as legitimate, restore or allow it.

2, Verify the Game Files in Steam

Open Steam > Library.
Right-click Yu-Gi-Oh! Master Duel > Properties > Installed Files.
Select Verify integrity of game files.

3, Sign In With the Intended Steam Account

If you use multiple Steam accounts, sign out and back in with the account that owns the Master Duel profile you want to use.
This helps rule out profile-related conflicts.

4, Test by Launching Steam as Administrator

Close Steam completely.
Right-click the Steam shortcut and choose Run as administrator.
Try launching the game again.

If the issue persists, checking the exact entry in Protection History will be especially helpful, as it can identify which file was blocked and whether Windows Security is involved.

I hope this points you in the right direction. Let me know if you need further assistance, feel free to ask me by clicking "Add Comment" or "Add Answer" if you cannot add comment so your response will be visible. Thanks for your effort.

Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.

Winston Falkenstein 0 Reputation points

2026-08-21T04:57:21.8233333+00:00

Hello Hendrix,

Thank you for detailed answer. I know it took some time to get this all down.

Sadly Windows Security Protection History shows nothing for me to reference.

I've verified game files in Steam for both accounts. No change.

I've signed in with both accounts. No change.

I've tried test by Launching Steam as Administrator. No change.

Is there anything you can suggest? Your efforts are appreciated.
Hendrix-V 17,965 Reputation points Microsoft External Staff Moderator

2026-08-22T07:09:21.8966667+00:00
Hi Winston Falkenstein,

Thank you for the update and for trying those steps. Since Protection History is empty, game file verification passes on both accounts, and the issue persists even when running Steam as Administrator, it may be worth checking whether the game's local configuration or user data became out of sync after the block notification appeared.

You could try the following checks:

1, Clear the game's local cache/configuration

Close Steam completely.

Navigate to: C:\Program Files (x86)\Steam\userdata

Locate the folders associated with your Steam accounts and make a backup before making changes.

Restart Steam and test the game again.

2, Check Windows Security exclusions

Open Windows Security > Virus & threat protection > Manage settings > Exclusions.

Temporarily add the Steam installation folder and Master Duel folder as exclusions, then test the game.

3, Test with a new Windows user profile

Create a temporary local Windows account.

Sign in, install or launch Steam, and test Master Duel there.

If it works, that would suggest the issue is tied to the current Windows profile rather than the game files themselves.

I appreciate you taking the time to test the earlier suggestions. Hopefully one of the checks above helps narrow down the cause and gets you back into the game.
Winston Falkenstein 0 Reputation points

2026-08-22T15:48:15.5233333+00:00

Hello Hendrix,

Thank you again for your suggestions. I've tried option 1 and 2 already. It hasn't changed the issue. I'm a bit reluctant to try option 3 and create a third Master Duel profile even if it's temporary.

I think at this point I need to use Get Help. The game file/folder were changed by Microsoft directly per the message because I was switching between the Steam accounts and Master Duel profiles. This doesn't appear to be something I can fix on my end. From what I understand, having multiple Master Duel profiles isn't an issue but it was flagged for some reason.
Hendrix-V 17,965 Reputation points Microsoft External Staff Moderator

2026-08-23T05:21:24.3266667+00:00

Hi Winston Falkenstein,

Thank you for the update. Based on everything you've already tried, it sounds like you've ruled out most of the common causes. Since there are no entries in Protection History, Steam's file verification completed successfully, and the issue began immediately after the notification about a blocked game component, there may not be enough information available locally to identify exactly what was changed.

At this stage, contacting Get Help or Microsoft Support is a reasonable next step.

Please note that this is a user-to-user support forum. Moderators, contributors including external Microsoft employees cannot directly intervene in Microsoft product features or access back-end systems. Our role is limited to providing technical guidance on reported issues, requests, or ideas.

You may also want to reach out to the Master Duel support team if you have not already done so, as they may be able to confirm whether a game-specific profile, account association, or connectivity issue could produce the behavior you're seeing.

Answer 2

Thoura Sopheak Nanta 655

Hi @Winston Falkenstein

It's recommended to contact Steam support in this situation: https://help.steampowered.com/en/

Best regards,

Nanta

Winston Falkenstein 0 Reputation points

2026-08-21T03:26:54.7266667+00:00

Can Steam help with this? The message came from a change with my folders in my computer from Microsoft.