You need to resolve the issue reported by User5. Which PowerShell command should you run?

A company has a Microsoft Teams environment. The sales department and the support department set up teams with standard channels.
Users from the sales department report that the Files tab in one of the channels is not accessible.
The following message displays:
Item might not exist or is no longer available.
You need to identify and resolve the issue.
What should you do?

You are the administrator for an organization.
A user named User1 can communicate with User2 from an external domain by using chat. User1 is not able to add User2 to a team.
You need to ensure that User1 can add User2 to a team.
What should you do?

A user works from a remote location and has a LAN connection and a mobile internet connection. Each connection is provided by a different internet service provider.
The user can make and receive calls by using the LAN connection. The user cannot make or receive calls by using the mobile connection.
You need to troubleshoot the issue.
Solution: Determine which calling policies are assigned to the user.
Does the solution meet the goal?

User1 shares a Microsoft Word document with User2 during a Microsoft Teams chat session.
User2 is unable to make any changes to the document.
You need to determine the root cause of the issue.
What is the cause?