Tip: Reuse authentication of MFA secured account over multiple Connect-PnPOnline calls

A best security practice to connect into SharePoint Online is configure MultiFactor Authentication (MFA). When connecting from PowerShell to SharePoint Online this can give some challenges, as the default 'Credentials' based logon is not MFA aware. Resolution for this is to use either '-Interactive' or '-PnPO365ManagementShell' flag: both result that you are enabled to interactive address the MFA challenge.

Need to address the MFA challenge is acceptable to do one-time. But in an administration context, it might be that you need to execute settings over a set of sitecollections. Then it is not a pleasant experience to everytime need to (re)logon including MFA challenge. Common way to address this is by piping the authenticated SPO connection into the subsequent PnP calls. But Connect-PnPOnline does not support the '-Connection' flag (other PnP cmdlets do support it; PnP is not consistent across all its cmdlets). But I found an alternative that works:

• $connection = Connect-PnPOnline -Url $spoAdminUrl -PnPO365ManagementShell -ReturnCollection
• Connect-PnPOnline -Url <Url to other site collection> -Interactive -ClientId $connection.ClientId