Guest Access Reviews in Teams

Guest access is not a failure. It is how modern delivery work gets done.

The problem starts later, when an old contractor, supplier, agency or client contact is still sitting in Teams or SharePoint long after the work wrapped up. Nobody notices because the access was originally legitimate.

That is why guest reviews matter. They are one of the simplest ways to turn "we assume that is fine" into "we checked it, here is the owner, here is the reason, here is the expiry point."

Microsoft Entra access reviews exist for exactly this reason: access can be reviewed regularly so only the right people keep it. For Microsoft 365 groups, Microsoft also supports recurring reviews of guest users across groups, which is far more realistic than waiting for IT to remember every project.

Run reviews by owner, not by IT guesswork

The owner of the workspace should make the decision, because they know whether the relationship is still live. IT should provide the list, the schedule, and the guardrails.

This is the model I trust most:

1. Export guest users and group them by team, site, supplier domain or business owner.
2. Send short review packs to the owners of those workspaces.
3. Ask for a yes or no decision on each guest, not a vague opinion.
4. Remove access quickly where there is no clear reason to keep it.
5. Keep an exceptions log for the guests who stay.
6. Repeat on a calendar, usually monthly for sensitive spaces and quarterly elsewhere.

Signals that usually deserve a closer look

Signal	Meaning
Guest has not signed in for a long time	Access may be stale
Guest belongs to a team with no active project	Relationship likely ended
Supplier domain looks unfamiliar or outdated	Check contract status
Guest can access HR, finance or leadership spaces	Needs a named business justification
Workspace has no active owner	The workspace itself needs remediation

Ask better review questions

The quality of the review depends on the questions. "Is this okay?" is weak. Use short prompts that force a decision:

1. Does this external user still need access?
2. Which contract, supplier relationship or active project justifies it?
3. Which team, site or data set are they meant to access?
4. When should their access end or be reviewed again?
5. Who owns the relationship?

Owners can answer those quickly. If they cannot, that usually tells you enough.

A practical point people forget

Guest reviews do not fix every path to access. Nested groups, direct site permissions and old sharing links can still create awkward edge cases. So if a review result looks too clean, check whether the underlying access path is really the one being reviewed. That sounds fussy, but it saves false confidence.

The standard worth aiming for

Good guest governance feels calm. You know who the guests are, who owns them, where they can go, and when the question comes up again. That is a far better signal than a tenant with five hundred guests and a collective shrug.

References

• Microsoft Entra access reviews
• Microsoft manage access reviews
• Collaborate with guests in Microsoft Teams
• External sharing overview for SharePoint