ServiceNow for Microsoft 365アプリをTeamsに設定したら、Portal画面が表示されない

[NatsukiO]

ServiceNow for Microsoft 365でPortalが開けずエラーが表示されます原因と解決の機会を知りたい。
エラー：「ユーザー認証中にエラーが発生しました」
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考えられる原因は、以下。
・Azure Portalのアプリにインストールした[SSO and Activity Notification]のAPIの要求の値[TeamsActivity.send]を削除。（権限が強いため一時的に削除）
・カスタムポータルの埋め込みを実施。ESCポータル⇒XXサービスポータルに変更
・sys_properties＞sn_now_teams.portal.suffix ＞suffix＞Value＞XXspに設定
　※空の場合は標準でESCポータルになる。

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I can't open Portal in ServiceNow for Microsoft 365 and I get an error. I want to know the cause and the opportunity to resolve it.
Error: "An error occurred while authenticating user"
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Possible causes are as follows:
- Deleted the API request value [TeamsActivity.send] installed in the Azure portal app. (Temporarily deleted due to strong permissions)
- Custom portals have been embedded. ESC Portal ⇒ Change to XX Service Portal
・Set to sys_properties>sn_now_teams.portal.suffix>suffix>Value>XXsp
*If it is empty, it will be the ESC portal as standard.

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[Rafael Batistot]

Hi @NatsukiO 

This solution might help you 

https://www.servicenow.com/community/itsm-forum/dear-now-developers-i-m-facing-quot-user-authenticat...

[M Iftikhar]

Hi @NatsukiO 

I’ve come across a couple of similar cases in the ServiceNow Community where the ServiceNow for Microsoft 365 (Teams) app showed the error “An error occurred while authenticating user”. These might be helpful references:

In this case, the issue was due to a mismatch between Azure AD UPN and the ServiceNow user email. Adjusting the OIDC claim mapping resolved the authentication problem.
https://www.servicenow.com/community/ms-teams-forum/quot-error-while-authorizing-the-user-quot-facin...

Here, the error was also authentication-related. The resolution involved verifying that Azure AD attributes (UPN/email) were properly aligned with the ServiceNow user table.
https://www.servicenow.com/community/developer-forum/teams-tab-is-not-working-to-access-servicenow-p...

Thanks & Regards, 
Muhammad Iftikhar 

If my response helped, please mark it as the accepted solution so others can benefit as well.