How do I set up Single Sign-on with Entra ID?

Enter the domain that you will be using for SSO. After entering the domain, click the ‘Generate TXT record’ button. This will display the verification key that will be used to verify the ownership of the entered domain.
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To verify the ownership of the provided domain, you will have to add the verification key as a TXT record on your domain's DNS. Once the key is added, click on the ‘Verify domain’ button to complete the verification process.
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In your Microsoft Azure portal, search for the ‘Enterprise Applications’ service
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Create new application within this service
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After clicking the ‘New application’ button, you will be redirected to the application gallery. In the gallery, chothe the ‘Create your own application’ option.
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In the application form, provide a name for the application (e.g., RSVPify SSO) and select the Non-gallery option
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After the application is created, you will be redirected to the application overview page. Within this page, select the ‘Set up single sign on’ option or choose the ‘Single sign-on’ item from the navigation bar.
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On the next screen, select ‘SAML’ as the sign-on method.
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Copy the following fields into the RSVPify SSO configuration modal

Azure AD identifier -> Identifier / Entity ID

Reply URL -> Reply URL
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These values are available in the RSVPify SSO configuration form. Click the ‘Edit’ button in the top right corner of this step and add values from RSVPify to your Basic SAML Configuration on Microsoft Azure.
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Attributes & Claims

In this step, a custom claim must be added, which will be used for a successful SSO login to RSVPify.

Click on the ‘Edit’ button on step 2 to open the Attributes & Claims configuration. On this page, select the ‘Add new claim’ option.
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Create a new claim with the name set to ‘email’ and source attribute set to ‘user.userprincipalname’ as shown in the image below:
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Save the new claim and navigate back to ‘Enterprise applications > SAML-based Sign-on’ page.

SAML Certificates: Download the base64 certificate. Open the certificate using any text editor and copy its content to the RSVPIfy form.
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Set up “RSVPify SSO”. From this step, copy values to the corresponding fields in the RSVPify form.
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Login URL -> SAML 2.0 Endpoint (HTTP) or SSO URL
Microsoft Entra Identifier -> Entity ID or Issuer URL
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After filling out all necessary fields, save the SSO configuration on RSVPify.