External user added and removed in short timeframe

Original query, unchanged.

let TeamsAddDel = (Op:string){
OfficeActivity
| where OfficeWorkload =~ "MicrosoftTeams"
| where Operation == Op
| where Members has ("#EXT#")
| mv-expand Members
| extend UPN = tostring(Members.UPN)
| where UPN has ("#EXT#")
| project TimeGenerated, Operation, UPN, UserId, TeamName, ClientIP
};
let TeamsAdd = TeamsAddDel("MemberAdded")
| project TimeAdded=TimeGenerated, Operation, MemberAdded = UPN, UserWhoAdded = UserId, TeamName, ClientIP;
let TeamsDel = TeamsAddDel("MemberRemoved")
| project TimeDeleted=TimeGenerated, Operation, MemberRemoved = UPN, UserWhoDeleted = UserId, TeamName, ClientIP;
TeamsAdd
| join kind=inner (TeamsDel) on $left.MemberAdded == $right.MemberRemoved
| where TimeDeleted > TimeAdded
| project TimeAdded, TimeDeleted, MemberAdded_Removed = MemberAdded, UserWhoAdded, UserWhoDeleted, TeamName, ClientIP
| extend MemberAdded_RemovedAccountName = tostring(split(MemberAdded_Removed, "@")[0]), MemberAdded_RemovedAccountUPNSuffix = tostring(split(MemberAdded_Removed, "@")[1])
| extend UserWhoAddedAccountName = tostring(split(UserWhoAdded, "@")[0]), UserWhoAddedAccountUPNSuffix = tostring(split(UserWhoAdded, "@")[1])
| extend UserWhoDeletedAccountName = tostring(split(UserWhoDeleted, "@")[0]), UserWhoDeletedAccountUPNSuffix = tostring(split(UserWhoDeleted, "@")[1])