Hi @Luke Dalli, Vodafone (External),
Thank you for posting your question in the Microsoft Q&A forum.
Based on the information you have provided, looks like you need to grant access for everyone in your organization.
Can you share with me your sharing site settings?
Please double check in site permission > site access if the "Everyone except external users" shows up?
If not, you can navigate to Advanced permissions settings > Grant permission and check if that option shows up there.
Please provide more information so I can assist you better.
Thanks for your understanding.
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