"Unknown Error" when clicking on file in Teams

[Bob_Heinze]

I am getting the following error when clicking on a file in Microsoft Teams. Any idea what I can try to resolve this?

[#2]

Will the file open in SharePoint? On the Files tab select "Open in SharePoint", then try accessing the file from there .

[#3]

Bob, sorry for a few questions:

- Are you using the web version of Teams or the installed version? If the web version, perhaps re-start the browser or try a different one? 

- Are you clicking on an Office document (Word, Excel), and if yes, did that document open before, and if not is it an older version of Office (e.g., doc) or a non-Office document? 

- Network or computer issues? Perhaps try the 'turn it off and on again' option? 

- Anything else to help us identify what the problem might be? 

[#4]

Yes, the file will open if I open in SharePoint or if I hit "open in excel online". It only get the error inside of Teams. 

[#5]

It occurs in both the web version and desktop application. Yes I am clicking on the document form the files tab... I also have files set as "tabs" in the channel and they do the same thing from there. If I click on a file in a conversation... same result. And yes sir, I did try completely signing out of everything Microsoft and restarting the computer. Same result. :(

[#6]

Sounds like an update gone wrong possibly. Is it all files or just the one? Or just xlsx?

[#7]

It's all files. Excel, Word, PDFs, png, etc...

[#8 · Accepted solution]

If it's happening for other users as well and it's on web too as you said, then I would get a support ticket in asap. Not sure the service the Teams App connects to, to render, but it's working for me, might be something in your tenant / datacenter or something gone wrong. But if it's easy to reproduce via web, with more than one user you might have something going on there that needs reported.

[#9]

It's not for every user. It has actually only happened to two users. It happened last week and lasted for about a day for one user.... then it started working again. It happened to me also for about a day then started working again. But now it is happening again to me. It's crazy. 

[#10]

I agree with Chris, check with other users and if it's widespread, log a ticket. We are having no issues (in Sydney, Australia) with this. 

[#11]

Odd it's only a couple. Are both users located behind a corporate firewall / machine firewall? Wondering if the actual service itself is triggering anything there. Only other thing I could really think of that could cause it, seeing as I bet the opening of documents in Teams probably connects too and is rendered by the same service / engine the web page uses.

[#12]

Yes, both machines are behind a corporate firewall, but ALL of the machines are behind the same firewall with the same settings. Its just really weird to me that it works for awhile (like a week or so) then it the error shows up again for a day or so. 

[#13]

Yeah, odd. Hopefully support can help solve, but if you can't reproduce it now, might be hard to pin down, just reach out while it's happening to get some logs etc.

[#14]

@Bob_Heinze 

Experienced this today with myself and another user. Adding here to help others. 

I happened to close Teams at lunch and didn't reopen until 5pm. Works now. 
Seems like some sort of login cache issue. 

I didn't sign out on my phone, but wasn't using teams. 
I was also signed into Office all day. 

Hope this helps someone else. 

[#15]

@Bionicjoe 

I have the same issue.  For several days I just used the web version as a workaround.  Restarted several times but that didn't fix the issue.  Finally, I went into Task Manager and removed all tasks related to MS Teams.  That finally resolved it for me.

Hope this helps someone.

[#16]

@Chris Webb @Andrew Warland 

I am having this same issue.  We're using the free version of Teams.  The issue has affected everyone.  The files aren't on the sharepoint or on OneDrive.  I get the same result on the web app and the desktop app.  

I get the "unknown error" when trying to access an xlsx file that we turned into a channel tab. We also get the message "the specified list in invalid" when accessing the "Files" tab in every channel. 

Any help will be greatly appreciated. 

(@Matt_Anderton  adding you here as I noticed you had/have the same problem)

[#17]

@rpkin Hi Ryan, I have a few questions about this. First, when you say you are using the 'free' version of MS Teams, what actually does that mean? Do you have a corporate licence for Microsoft 365 and if so, what licence type (e.g., E3, E1 etc)? If you don't have a corporate licence, then you won't be able to access SharePoint which also means OneDrive. 

But I'm wondering what you are actually doing. I'm happy to help out but need a bit more basic info first, starting with your licence type. It is possible your users are 'front line workers'? Thanks

[#18]

@rpkin I assume you are trying to do something like this ... 

Spoiler

@rpkin 

[#19]

@Andrew Warland 

I had actually already done that and now when I access that tab I get this: 

[#20]

@Andrew Warland 

I'm using the free version of Teams.  This is a screen shot from the Microsoft website:

So you can see in the image that it lists file storage.  We were using this file storage and it appears to be gone now.