No idea. It’s been two years since the article appeared.

The easiest and quickest way is to remove the guest accounts from Azure AD. That might be a tad drastic too, but it will work.

Thanks for this explanation, really helpful – do you know of a straightforward way to revoke guest access to a site for an individual before the access expiration date kicks in please? I would like to revoke guest access to a couple of users before then

We have E3 licence. How can we get expiration option available, when sharing files with guest users?

Thanks

I don’t believe so.

What I mean is that SPO can be (I believe it’s still optional) integrated with Azure B2B collaboration (see https://office365itpros.com/2021/08/17/sharepoint-online-embraces-azure-b2b-collaboration-external-sharing/). When this is configured, guest accounts are created each time someone shares a document or folder. These guest accounts are liable to the expiring access policy. Guest accounts created by Microsoft 365 groups and used to share documents with group members are not.

You mention in a comment above that it will affect sharing granted to guest accounts because “SPO is integrated with Azure AD for B2B collaboration”. Does this mean the AD B2B collaboration is different to guest access via an M365 Group?

External collaboration is so confusing as there are many ways to achieve it.

The expiring access policy works for direct sharing only. It doesn’t affect the access guests obtain through group membership. It would affect sharing granted to guest accounts when guest accounts are created because SPO is integrated with Azure AD for B2B collaboration (as it should be).