When you decide to add users for all your Site Collections, you can't simply run through all the sites in your tenant. Why? Because what you "see" in the SPO admin center, is not reflecting what you really have. There a few Site Collections that are not visible. A few examples would be:
Author: Arjun Menon
Author: Joseph Velliah
Inspired by: Albert-Jan Schot
Inspired by: Rakesh Pandey
Author: Joseph Velliah
Author: Arjun Menon, Inspired by Patrick Lamber
Inspired by: Rakesh Pandey, Patrick Lamber
Author: Sébastien Levert
Author: Veronique Lengelle
Author: Matti Paukkonen
Author: Pete Skelly
Author: Albert-Jan Schot
Author: Martin Lingstuyl
List all team members in Microsoft Teams teams in the tenant and exports the results in a CSV.
Author: Patrick Lamber
Author: Nico De Cleyre, Inspired by Salaudeen Rajack
Author: Albert-Jan Schot
Inspired By: Salaudeen Rajack
Inspired by: Alan Eardley, Patrick Lamber
Inspired by: Alan Eardley, Patrick Lamber
Author: Patrick Lamber
Author: Joseph Velliah
Author Emily Mancini