4,141 questions
I tried to install above, the issue persists.
Getting "There was a problem reaching this app." after some time on a custom tab in Teams. How can we fix this?
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(272, 63%, 36%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EDV%3C/text%3E%3C/svg%3E)
Deshpande, Vrushali
5
Reputation points
Hi team,
We've developed a web app, and integrated it as a custom tab in Teams, with "personal", "groupChat" and "team" scopes. The tab is initially loading up fine, and we're able to see and interact with the web app properly. However, after a minute or so, we're getting a connectivity error from Teams, saying that there was a problem reaching the app, with a Retry button. Attaching a screenshot of the error. And this is happening every time after ~1 minute.
We'd appreciate any help here, since we've been trying to get this investigated and fixed for quite a while now, but coming up blank every time.
P.S.: It's not a problem with the web app itself, since we tried with a different web app just to check, and we faced the same issue for that one as well.
Microsoft Teams | Development
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![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(160, 48%, 25%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ESM%3C/text%3E%3C/svg%3E)
Sayali-MSFT 3,991 Reputation points Microsoft External Staff Moderator2025-03-20T05:12:08.37+00:00 Deshpande, Vrushali, Thank you for your inquiry about your Teams app development issue! To assist you better, could you please provide the following details?
Reproduction Steps: Please share the steps you took to encounter the issue.
Documentation Links: Any specific documentation you followed that relates to your problem.
Teams Client Version: What version of the Teams client are you using?
Code Snippets: Relevant code snippets that illustrate the issue.
Manifest Package: If applicable, please share the manifest package for your app.
This information will help us better understand the situation and provide a more accurate response.
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Deshpande, Vrushali 5 Reputation points
2025-03-20T06:32:12.2466667+00:00 I created custom teams application using visual studio. And uploaded attached menifest file menifest.txt with Upload custom app option. My teams version is 25044.2208.3471.2155.
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Sayali-MSFT 3,991 Reputation points Microsoft External Staff Moderator
2025-03-20T08:09:01.28+00:00 Deshpande, Vrushali, can you please share Teams Client logs and a network trace showing the failure?
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Deshpande, Vrushali 5 Reputation points
2025-03-20T09:32:51.03+00:00 -
Deshpande, Vrushali 5 Reputation points
2025-03-20T09:34:24.9366667+00:00 MSTeams_2025-03-19_19-05-19.04.log ConsoleError.png
Attached is network trace, log and console error
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Sayali-MSFT 3,991 Reputation points Microsoft External Staff Moderator
2025-03-21T11:17:53.07+00:00 Deshpande, Vrushali, We are currently unable to replicate the issue you are experiencing.
We are checking with the internal team and let you know the update. -
Sayali-MSFT 3,991 Reputation points Microsoft External Staff Moderator
2025-03-24T06:13:02.02+00:00 Hello @Deshpande, Vrushali,
We received a response from the internal team stating that 'Teams apps need to import and initialize teams-js when running inside of Teams.
More information can be found at: https://www.npmjs.com/package/@microsoft/teams-js.
If an app does not perform this step, it may eventually time out and display a warning/error, as we assume the app has failed to load.'
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Deshpande, Vrushali 5 Reputation points
2025-03-24T07:37:53.7533333+00:00 -
Deshpande, Vrushali 5 Reputation points
2025-03-24T09:41:21.37+00:00 I used App validation tool from Developer portal to validate my application attaching the report. Validation Report giving 403 error with no details. Can you please help? Application do not need any authentication
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Sayali-MSFT 3,991 Reputation points Microsoft External Staff Moderator
2025-03-28T07:21:32.3166667+00:00 Deshpande, Vrushali, there could be several reasons for encountering a 403 error during the app validation process in the Teams Developer Portal if authentication is not required for your app.
Ensure your app package complies with all required configurations and validation criteria. Use the validation tool to review the test cases.
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