SharePoint Document Library in Teams - Cannot have two HTML5 backends at the same time.

Question

My entire company recently started having issues viewing previously established SharePoint document libraries form within teams. When we try to view a document library in teams we receive the error message below stating "Something went wrong Cannot have two HTML5 backends at the same time."

We had originally added it into the teams channel as a "SharePoint Document Library", but we didn't like that it sorted folders by edit date instead of alphabetically.

Document Library View

So I removed it from Teams and re-added it as a "Sharepoint Site". I have each departments Document library setup in their team this way. Plus it worked as we wanted, while sorting alphabetically.

SharePoint Site View (Alphabetical)

Nothing has changed since then. Last week it just started generating the error message below for all users. If we click "Retry" it automatically comes back up, but it's a pain to have to "Retry" every time a user switches channels/chats and comes back to that error again.

We don't have any Webparts added to our SharePoint site. We solely have a site setup for each department and they only use the document library function. We don't use it for team sites, company communications, etc. I say that because I saw another user had this issue, but republishing the unpublished web part seemed to help them. I checked (Just in case) but we don't have anything unpublished or any webparts other than the document library.

I appreciate any help or similar experiences you may have had.

Answer 1

We are facing the exact same issue. Did anyone find a solution for it yet?

Answer 2

I may have fixed it... If you click the drop down for the Document Library in Teams, and then go to Settings, Add Content--> Document Libraries and then select the Document Library in question. Let me know if this works for anyone else, otherwise I'll keep using it this way and see if it sticks.

Answer 3

Hi @Shane Gibeault ,

I tried to reproduce your problem in a test environment without success. I suggest opening a ticket for more direct help and asking Microsoft engineers to do more in-depth research.
Microsoft 365 admin center: Support->New service request

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Answer 4

Hi @Xuyan Ding - MSFT

I figured that would be the case, but thought I'd check. Unfortunately we have a CSP so it takes a week of them guessing until they finally escalate it to Microsoft so we can get some real support.

Thank you very much for trying though, I do appreciate that!

Answer 5

My team's Team channels have been experiencing this exact issue for about 1-2 weeks now using the same functionality originally described (adding a tab as a SP site instead of Library).