[Planner] permissions like [Documents] permissions

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Goal

I have multiple Planners in a SharePoint

I would like to set [Outside Guest] permissions to access only certain Planners

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I don't think this is possible. Planner plan's are secured by the underlying O365 Group and simply linked to the SharePoint site. There are no permissions to tweak in the site for the plan.

I suppose you could:

• Create separate Planner plans with security membership that meets your needs
• Add security trimmed site pages that use the Planner web part that link to the respective plans

The downside is maintaining security in multiple places.

I hope this helps.

Norm