In my scenario it would be nice (and with as less risks as possible for users maing mistakes) to enter an e-mail address in a text field and that Microsoft Flow would be able to assign the desired permissions to this external / guest account on that site / list / item.
If the option to disable the invitation e-mail would be included in this Flow Action, we could send an own instruction mail on how to log on (register account as Microsoft Account).
This way would be able to automate this action with as less risks as possible.
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