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in our SharePoint-Online tenant, external sharing isn't possible anymore from one day to another.

No one changed something in the admin settings and the settings should be set correctly: sharePoint sharing admin settings

The enduser sharing dialogue looks like this since a few days:

enduser sharing dialogue with message "your admin blocked it"

External sharing isn't disabled on sharePoint site collection level, it's not possible on all sharePoint site collections: team sites and communication sites.

Has someone experienced something similar? Was there an update from microsoft who could have something to do with this?

Thank you for your help!

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First have a try to use powershell to set sharing ability. If this works for a certain site, you can apply this for all the site collections in your tenant

connect-sposervice -url https://<domain>-admin.sharepoint.com -cred(get-credential)
set-sposite -identity <siteURl> -SharingCapability ExternalUserAndGuestSharing
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  • Thanks, I guess this is the same Setting as Akshay proposed in the GUI? – ediordna Aug 28 at 11:16
  • @ediordna, Yes, so you can try either and have a check. PowerShell takes in effect in seconds so i usually take this way. – Jerry_MSFT Aug 31 at 2:05
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you can do this from SharePoint admin center.

Navigate to SPO Admin Center >> Active sites >> select site from list of active site

On top bar you will see Sharing command click that.

enter image description here

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  • Thanks, I need to check this with a colleague, who has writing admin Rights. :D In my admin Center it looks a bit different but indeed the Setting is on "only persons in your organisation". I recognized, that there is a quite similar Setting in: Microsoft 365 admin center -> ressources -> Websites. Has the setting there the same effect? Still the Question is open who this could change on itself from one day to another. A few days ago external sharing was possible on all our SharePoint sitepages. – ediordna Aug 28 at 11:15
  • I am not very sure but this MAY BE impact of the latest feature released from Microsoft regarding time bound external access. You may find details in Message center. I am hearing this from lot of other users as well – Akshay Randive Aug 28 at 11:36
  • Do you mean this Roadmap-Item: microsoft.com/de-de/microsoft-365/… ? – ediordna Aug 31 at 7:44
  • no not the road map, the message center under tab in your Admin center. – Akshay Randive Aug 31 at 9:48
  • yes, I came from the message Center notification, the Roadmap-item was linked there. I couldn't link the message Center notificiation (becaus it's only accessible in own Admin Center, so I linked the associated Roadmap-Item. – ediordna Sep 7 at 6:39

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