The Microsoft 365 Groups Report (membership of groups and teams) originally used the Azure AD and Exchange Online PowerShell modules. Now its code uses only cmdlets from the Microsoft Graph PowerShell SDK. It’s an example of the kind of update that many organizations are going through due to the upcoming deprecation of the Azure AD and MSOL modules.
The Get-AssociatedTeam cmdlet is part of V4.6 of the Microsoft Teams PowerShell module. It reports the membership a user account has in teams, including where the account has direct membership of shared channels. The cmdlet makes it easy to generate a report of teams membership, and the PSWriteHTML module makes it easy to output nice PDF reports.