My O-365 tenant is set to automatically expire external guest collaborator access in 6 months. Can a Site Collection owner override this policy?

Hi @frob ,

The setting of automatically expire external guest collaborator has two levels：Global Level(O-365 tenant) and Site Level.

Site Collection owner can decide to extend it for external guest, it will automatically extend to the maximum period allowed/set within the SharePoint Admin Center(Global Level). For example, if your limit is 6 months, it will add 6 months to today’s date and will extend access for the user until that future date.

Site permission->Manage Guest Expiration

I found a blog for you that introduces in detail how to set expiration for guest access and answers to common questions, please refer to：How to set up expiration for guest access to SharePoint and OneDrive

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