"Invalid Access Token" Error When Clicking "Start Microsoft Teams Chat" Button on the UIIssue When a user clicks the "Start Microsoft Teams Chat" button on the UI for a catalog task, an error appears stating:"Invalid access token, please check your credential alias."ReleaseN/ACauseThe error occurs because the OAuth Credential linked to the user for Microsoft Teams is invalid or expired, causing the access token to be rejected during chat initiation.ResolutionGo to the OAuth Credentials list view in ServiceNow.Find the credential named 'Microsoft Teams Chat' associated with the user who received the error.Delete that OAuth credential record.Ask the user to click the "Start Microsoft Teams Chat" button again.The user will be prompted to log in to Microsoft Teams, and a new OAuth credential with a valid access token will be created automatically.