The SharePoint folder name must match the channel name. Renaming the SharePoint folder breaks the link between the channel and the folder.
Topic 1, Fabrikam
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Background
Fabrikam, Inc. Ltd. is a pharmaceutical company with offices in the USA, UK, and Australi a. The company has the following departments:
IT
Sales
Human resources (HR)
Research and development (R&D)
Technical support
Legal department
You join the company as a Microsoft Teams administrator.
Current environment
Active Directory
The network contains an on-premises Active Directory domain. All user accounts are assigned to departmental organizational units (OUs).
Microsoft 365
You assign all employees a Microsoft Office 365 E3 license. Fabrikam has recently migrated from Skype for Business server to Microsoft Teams.
Network environment
The company uses a combination of IPv4 and IPv6 addresses.
Calling
The company plans to use a Session Border Controller (SBC) connected to Phone System Direct Routing for their telephony solution. The company registers the SBC domain name, sip.contoso.com, in as tenant domain.
Requirements
Emergency calling
You must configure a tenant trusted IP list for emergency address locations.
Security
Sales interns must not have the ability to share files in one-on-one chats. Teams and channels must meet following compliance requirements:
You must create the following groups for teams and channels: Team Owners, Team Members and Team Visitors.
The Team Visitors group is for internal UserX that does not have access to the Private channels chats, but does have access to SharePoint sites for auditing the files within the private channels.
Channels for the different departments must not inherit permissions from the parent sites. Permissions for each channel must be unique.
ProjectNextGenApp
The R&D team has a private channel named ProjectNextGenApp. The members of the channel need to collaborate on files with an external user, but they do not want the external user to be able to read and send messages in the channel.
Legal department
You must ensure that users in the legal department can view the files uploaded by owners within one channel or access SharePoint.
Issues
CEO
The company's CEO reports that they do not receive notifications for chat messages in the desktop version of Microsoft Teams.
AdministratorA
AdministratorA is configuring Direct Routing. The administrator runs following PowerShell command to pair the SBC to the tenant or add the SBC from the Teams admin center.

The following error message displays:

Human resources manager
The human resources manager is unable to access the files in a Private channel named StaffRecruiters. He gets an error message when they select the Files tab that the Item does not exist or no longer available.
Audit team
Users who are part of the audit team report that they were unable to access the Files tab of a channel in the team. The following error message displays when they attempt to access files:

User1
User1 reports high CPU usage while using the Teams application and would like to know more on how Teams uses resources.

User2
User2 reports that automatic updates for the Teams client are not working.
User3
User3 reports that they are not able to download a file that was shared with them in a one-to-one chat within the Files tab. The following error message displays:
"This item might not exist or is no longer available."
User4
User4 reports that the following message displays when they navigate to the SharePoint Site for the private channel:
"Access denied"
User5
User5 has multiple groups and contacts but none of the groups or users appear in the Teams app. The Contact List Provider for User5 is listed as Unified Contact Store (UCS).
User6
User6 reports that they are not able to download a file that was shared with them in a one-to-one chat within the Files tab and receives the follow error message:
"This item might not exist or is no longer available."
Emergency calling
Users report that the Teams app does not display an emergency address in the calls section of client settings. No emergency address is listed when placing a call. You collect Teams debug logs from a user. A representative section of the log is shown below:

Reports
Users within the company report poor quality when they make Teams calls and dial telephone numbers. You must generate the following reports to troubleshoot the issues:
Report1: Show Public Switched Telephone Network (PSTN) calls for the last 28 days.
Report2: Compare usage and quality across users.

Reference:
https://www.thatlazyadmin.com/2019/07/09/how-to-prevent-microsoft-teams-guest-users-from-inviting-guests/