Forum Discussion
MS Teams Application HTTP Context Session Changed when Postback
I have a MS Teams App that contains tab for opening SharePoint Add-ins (Provider-hosted) pages. When using MS Teams Desktop and web, the session always changes when Postback and failed to get ShareP...
ChetanSharma-msft, I have sent through Private message for all info I have on my side.
ChetanSharma-msft
Microsoft
Microsoft@Tannie - Thanks a lot for sharing the detailed repro steps.
We will try it from our end and let you know the updates.
We will try it from our end and let you know the updates.
- How about the scenario mentioned by ivo-beemster?
They are not using SharePoint add-ins but an external webpage which has used ajax calls. 
Meghana-MSFTEngineering team has gone through the bug and has said that -
This is not a supported scenario. SharePoint add-ins have not been designed to work in clients embedding SharePoint pages. We do have SharePoint Framework for that scenario.The "SharePoint Add-In" and "Provider Hosted App" combination is an extensibility platform from 2012 or so,and has been getting phased out for the past several years.- Meghana-MSFT
We have informed the engineering team about this issue, please be assured that I will keep you posted on the updates. 
we have the same problem. We have created a simple app the loads an external webpage.
The page makes some additional ajax calls to the server.
when we debug on the server:
each ajax call from the teams app has his own session_id.
when we access the page through a browser every ajax call has the same session_id (as it should be)
is there a fix for this issue?
- HI
I have already shared all the steps and logs to u on Feb 08 2022 through Message Box.
I have just sent you some additional information that have sent to Meghana be4. Please check if it helps.
Remember to put click event to the button. - ChetanSharma-msftHello Yannie - Can you please share the deploy details, so that we can try it from our end?
- ChetanSharma-msft
Yannie - We are not able to repro it.
It will be really helpful, if you can provide us a deployed version of SharePoint Add-in for our testing and investigation ? - Meghana-MSFTCurrently there are no updates. I will post here if there are any updates.
Meghana-MSFT Please let me know if there are any updates, thank you
- Meghana-MSFTWe have added an on click event to the button and now its working on web but does not work in MS Teams. We are checking this with the engineering team.
Meghana-MSFT, please note that the issue ONLY happens in Teams 🙂 Mine looks fine in browser.
- Meghana-MSFT
Yannie - We were able to repro this but we see that, this issue is happening in browser as well. This does not seem like an issue on Microsoft Teams side. Could you please confirm it?
- Meghana-MSFT
Yannie - I tried creating a developer site as you suggested and created a project again. I am getting Microsoft.SharePoint.Client.ServerUnauthorizedAccessException after running the project. I apologize for asking many times. Is it possible for you to share developer site url and demo tenant details so that it would be easier for us to check this issue.
- Meghana-MSFT
Yannie - Could you please let us know what URL you have given here in this step? We tried with sharepoint site URLs but it gave us "Error occurred in deployment step 'Install SharePoint Add-in': Sideloading of apps is not enabled on this site. testSPAddIn 0" while running the code from Visual studio.
