This script takes a group name & email nickname
Checks if there are groups called groupName, groupName+"_Manual", groupName+"_Dynamic"
If there aren't, it makes them
Most importantly, it gives the group groupName the dynamic rule "user.memberof -any (group.objectId -in ['$($group_manual.id)', '$($group_dynamic.id)'])"

Gets all your M365 groups
Checks if they have welcome messages enabled If they do, it turns them off

Exactly what it says on the tin
Takes a GroupID as input

Using the Microsoft Graph ==Beta==
It gets all the registered devices
Gets what userid most recently signed in
Gets that user's display name
Displays it all in a Format-Table table

Using both Mg-Graph and Exchange Online
Takes a manager's Display Name
Gets all that manager's direct reports
Gives the direct reports view access to eachother
Gives the manager edit access to each report