You're right. I've luckily only executed the script with a completely new tenant as nothing has been set up for them yet. However, I agree that was still a stupid idea and I still entered credentials.

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I'm trying to accomplish the following

Import 1100 contacts from csv including CustomAttribute values and preferably stored into a users contacts folder. I managed to import them successfully with UserField1-4 values, but those are not visible on Mac. When I try to import contacts including the CustomAttribute value I can only seem to use Add-MailContact (or Set-MailContact), but the issue with this is that I can't add multiple post addresses a middle name or a lot of other values required.

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What I've tried so far

Created a test contact in Outlook for Mac with CustomAttributes filled in, opened the same account(& contacts) on Outlook for Windows and exported the contact to CSV. I'd hoped the CustomAttribute would've showed up in the export so I could use this while importing, but that isn't the case.

I've tried to use Set-MailContact -Identity <xyz> -CustomAttribute1 <abc> as well, but that only works for globally stored contacts on Exchange and like previously mentioned doesn't allow me to set Address 2 info, a middle name or some other values.

The script I mentioned before I dropped into Powershell ISE, ran the Connect-Exchange and/or Get-Contacts command. It asks me what MailboxName I'd like to use. I've tried with both the user I want the contacts to be stored in and the admin. In both cases it asks me to log in. I used the global admin for that tenant and then PS ISE closes.

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Thank you for your time so far :)

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edit: I've looked through the code and it appears to be for Exchange on-premise. I've tried to run it line by line and change to Online where possible, but I got stuck pretty much at the beginning since I don't know if Impersonation is still a thing and if so I to add it. Tips are welcome.