SharePoint Online access not working for ines.ch users

Hi everyone,
Thank you for the CSI Build Days!
Several of us at ines.ch are trying to access the CSI Build Days https://microsoft.github.io/github-constellation-software/build-days/#previous-session-recordings in the SharePoint Online environment, but we're all getting the same error saying our accounts aren't set up in your tenant.

Since this affects all ines.ch users and not just one person, it looks like our accounts (or our domain) first need to be added as external/guest users in your tenant, or the external sharing settings may need adjusting on your side. Could you please look into this, or let me know who we should contact?

Thanks a lot for your help!

Best regards,
Sibora Xhema

Non viene menzionato alcun file del repository, test o punto di ingresso. Inizia controllando la configurazione del tenant SharePoint Online e le impostazioni di condivisione esterna o degli utenti guest; l’attività è completata quando gli utenti di ines.ch possono accedere alle registrazioni di Build Days collegate oppure vengono indirizzati all’amministratore del tenant responsabile.