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I'd like to test this log in flow without setting up the whole script. from what I can tell it just creates a dummie account on prem, but I can't tell what links the on prem account to the b2b guest account.

what actually links the on prem ad account to the azure b2b guest account?

I am getting following error, "Connect-MgGraph : certificate was not found or has expired."

Updating the powershell to use -Certificate switch seems to be working (highlighted in yellow - Fix.png)

Running the script and just comes up with "Welcome To Microsoft Graph!"
No other output generated, when breaking it down line by line, looks like $UsersInB2BGroupHash not generating anything (just empty)

$samaccountname = $samaccountname -replace ".$" should be added in #regio 6

I tired on my test environment and Customer's product environment. It's working well on my environment, but only partial user got synced to on-prem OU for my Cx's product environment.

I cannot really tell the difference between B2B guests. Captured fiddler trace and I can saw all the user are in the server http response. It looks issue happened on the active directory PS module. But we don't know how to troubleshoot and fix that.

And by the way, it seems if you have B2B Guest UPN with exact 20th char end with ".", you will fail to run the scirpt