> ## Documentation Index
> Fetch the complete documentation index at: https://docs.polygon.technology/llms.txt
> Use this file to discover all available pages before exploring further.

# Sign-in providers

> Choose how people sign in to your organization and which email domains you can invite.

The **Sign in providers** tab in **Admin > Organization settings** controls how people sign in to your organization and which email addresses you can invite. Only organization Admins can see this tab. Changes here apply to everyone in your organization.

## Sign-in methods

Turn each method on or off: **Email**, **Google**, **Microsoft**, and **Apple**. People can sign in to your organization only with the methods that are on.

> [!WARNING]
>
> Before you turn off a method, make sure everyone who uses it can sign in another way. For example, if you turn off **Email**, people who don't use Google, Microsoft, or Apple won't be able to sign in.

People who sign in through single sign-on (SSO) join your organization as members with read-only access. They can't work in a project until an Admin adds them to one from **Team members**. See [Manage team members](https://docs.polygon.technology/help-center/organization/manage-team-members.md#give-a-member-access-to-another-project).

## Email domains

Invitations are limited to email addresses on your allowed domains.

* **Allow invitations from any domain:** turn this off to limit invitations to specific domains.
* The list shows each domain and how many members use it.
* To add a domain, type the domain name in the field at the bottom of the list, then select **Add a domain**.
* To remove a domain you added, select the trash icon next to it.

## Frequently asked questions

> [accordion] Why can't I see the Sign in providers tab?
>
> Only organization Admins can see it.

> [accordion] Someone signed in with SSO but can't see any data. Why?
>
> People who join through SSO start with read-only access and no project. An Admin needs to add them to a project from **Team members**.

> [accordion] Why can't I invite someone with a particular email address?
>
> If **Allow invitations from any domain** is off, you can only invite addresses on your allowed domains. Add their domain under **Email domains**, or ask an organization Admin to do it.

> [accordion] Why can't someone sign in with Google, Microsoft, or Apple?
>
> Check that the method is turned on under **Sign-in methods**. People can only use the methods that are on.