error 1001

Hey has anyone been experiencing error 1001 within your AVD users. It happens random users at random times. 

Have tried multiple things but cant seem to resolve. 

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Jan Scholte

Hi Jonathan, 

Please check this ongoing topic in Microsoft support: Outlook 365 app error 1001 on RDS environment ( FSLogix) - Microsoft Community
Skip to the last pages there are some fixes that work for some situations.

One of the fixes described there I've seen to resolve the 1001 error:

Hi everyone!

I've been following this thread for a while and so far, our client's environment has been stable since end of November. Here are the things to note so far:


Deploy these registry keys:
[HKLM\SOFTWARE\Policies\Microsoft\Windows\WorkplaceJoin]

"BlockAADWorkplaceJoin"=dword:00000001




[HKLM\SOFTWARE\Policies\Microsoft\Windows\WorkplaceJoin]

"autoWorkplaceJoin"=dword:00000000"




Delete these registry keys, if possible, Microsoft doesn't recommend using these anymore:
Computer\HKEY_CURRENT_USER\SOFTWARE\Microsoft\Office\16.0\Common\Identity

EnableADAL

DisableAADWAM

DisableADALatopWAMOverride




If you're using FSLogix, make sure to enable this policy through main GPO:
RoamIdentity




Lastly, if users did register the RDS to Azure AD, might have to follow these steps:
- Download (WPJCleanup.zip) https://download.microsoft.com/download/8/e/f/8ef13ae0-6aa8-48a2-8697-5b1711134730/WPJCleanUp.zip

- Extract and run the .cmd file

- Confirm if the WorkPlaceJoined indicates "NO"

- Reenter credentials to outlook (might have to log out and log back in to the RDS)




Let me know if that helps or not. We're looking to deploy this to other clients since it appears to be working fine but I hope it helps with your case.




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Jonathan Giraldo

Hey thanks for the details. I will try it out and report back if I see any improvecment. 
I should check entra ID and conifrm no one is showing as registered for the RDS servers right? Is that what you mean by 

Lastly, if users did register the RDS to Azure AD, might have to follow these steps
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Jonathan Giraldo

So upon further invistagting the AVD hosts show a bunch of users as Entra Registered. I am wondering if I should delete all those entries after I create the registry entried to block workplace join. 

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Jan Scholte

Jonathan Giraldo yes you can clean those up, did you manage to fix the 1001 error this way ? 

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Jonathan Giraldo

So the problem with this error is that it is happening at random times and random users. It could go for about 1 week or even a month with out happening. 
I implemented the tix and now I am on the lookout. 

I will keep you posted. 
Thank yoiu Jan!

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Jan Scholte
(Edited )

Hopefully, this information helps, Jonathan Giraldo In addition to the steps discussed earlier, sometimes issues can arise from incorrect SSO settings, particularly when there’s an ADsync setup involved. Make sure to double-check the SSO settings in Azure AD Connect and verify the GPO for site-to-zone assignments that affect SSO. For more details: Setting up Single Sign On (SSO) with Azure AD Connect — LazyAdmin

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