Unable to use join operator

[Dinesh_G]

Hi,
I'm unable use join operator.Please help me what's wrong in my syntax
Signinlogs
| where IPAddress==" xxx"
|project ______
|join
AADNoninteractiveSignInLogs
| where UserDisplayname=="xxx"
This is the query I'm using I'm getting below error
Error: Join Operator is missing on clause
Please suggest what is wrong

[#2]

When using join you need to tell it what column to join on (must exist in both tables)

SigninLogs
| project UserPrincipalName, IPAddress
| join kind=inner
AADNonInteractiveUserSignInLogs on UserPrincipalName, IPAddress