
Hi dave,
Good day! Welcome to Q&A forum.
You can manually Grant Access in SharePoint
- Open the SharePoint site (https://gebaeudesimulation.sharepoint.com/)..)
- Click Settings (⚙) > Site Permissions.
- Add the guest manually (if they’re missing) with "Read" or "Edit" permissions.
Hope these information helps.
Please do let us know if you have any further queries.
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