June 25 Auth0 Community Ask Me Anything: Multiple Custom Domains

Community News Community AMA Series
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We’re excited to invite you to our next online Auth0 Community Ask Me Anything (AMA) on June 25, 2025 with Pawan Bhardwaj, Principal Product Manager where we will dive into Multiple Custom Domains (MCD).

This is your opportunity to learn how MCD lets you serve multiple brand identities from a single Auth0 tenant, supporting tailored login experiences, branded email templates, and more. Whether you manage several B2C brands or offer white-labeled solutions for SaaS clients, this feature helps deliver consistent branding and seamless user experiences without the need for multiple tenants.

We’re currently in beta and gearing up to expand availability through Early Access. If you’re exploring MCD or thinking about how it might fit into your architecture, we’d love to hear from you. Your questions and feedback will help shape how we support and evolve this capability.

How it Works

From June 9 to June 24, 2025, Auth0 developers, customers, and community members are invited to submit their questions about Multiple Custom Domains right here in the Auth0 Community. Just click “Reply” on this dedicated thread. Then, on June 25, from 9:00 AM to 11:00 AM PST, our product expert will be online and actively responding with detailed written answers to all questions submitted during the two-week period.

:tada: As a bonus, everyone who participates will earn points and a special community badge!

What You’ll Learn

:white_check_mark: What Multiple Custom Domains capability is, how it works, and why it matters
:white_check_mark: How MCD enables tailored, fully branded experiences across channels like Unified Login and email
:white_check_mark: How consistent use of custom domains enhances your security posture and builds end-user trust
:white_check_mark: How MCD simplifies operations by allowing you to manage multiple brands or clients from a single tenant - no need for redundant configurations
:white_check_mark: Why this enhancement helps improve speed to market, streamline administration, and support scalable growth for B2B SaaS businesses
:white_check_mark: What’s the functionality in Limited EA and GA
:white_check_mark: Answers to your specific technical or strategic implementation questions

Submit your questions by clicking the “Reply” button below anytime between today, June 9, and June 24, 2025.

Featured Expert

Pawan Bhardwaj - Principal Product Manager

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Pawan is a Platform Infrastructure Product Manager at Auth0, leading the cross-domain Multiple Custom Domain (MCD) initiative. Since joining in 2023, he has focused on platform scalability, performance, reliability, and deployment flexibility.

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Looks like a great AMA!

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Hi What is the timeline for Early access availability of this multiple custom domain feature as we require this for a customer project now thanks

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Will Universal Login, email templates, and error pages support domain-specific logos, colors, and copy?

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Hi there!

Will there be an Action method that we can use to switch white-label themes dynamically based on the incoming custom domain or Organization?

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Does enabling Multiple Custom Domains add any additional cost, SKU, or minimum plan tier for customers?

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The problem I have is that I have another domain that I need to talk to our backend server and also need to use the passwordless login option. How can I enable the second custom domain to talk to the same resource backend and not trigger popup blockers.

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Hi everyone !

What happens to cookies and SSO when a user moves between apps on different custom domains within the same tenant?

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What other use cases (apart from above) did you base this capability from? What are the things that I should consider in order to determine whether I should add an application to an existing tenant or create a new one?

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Let’s take an example like myDisney (I’m not affiliated with Disney and I also know it’s not using Auth0).

myDisney is unified login system across various Disney services. It allows users to access multiple Disney platforms, including Disney+, ESPN, Hulu, and Walt Disney World, with a single email address and password.

If you were to rebuild this in Auth0, how would you propose to do it? And would you use the multiple custom domains construct?

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We appreciate your participation in the AMA thread by posting a question! :tada:
Your AMA Participant badge will be awarded once the event concludes—stay tuned! :sparkles:

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We appreciate your participation in the AMA thread by posting a question! :tada:
Your AMA Participant badge will be awarded once the event concludes—stay tuned! :sparkles:

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Hello Developers :waving_hand:
I’m Pawan Bhardwaj, Principal Product Manager at Auth0
Delighted to be here with you today. Will be answering the questions and available online for the next couple of hours.
Thanks for posting these questions already.

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Hi Mohan, thanks for the question.
The Limited Early Access release will be made available the week of June 30th for Public Cloud tenants, and the following weeks on Private Cloud deployments. The specific availability date varies based on region (and chosen deployment release and window for Private Cloud).

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Hi Gerald, thanks for the question.
Post-login Actions run after login, hence it’s not possible to change UI components based on the incoming custom domain with Actions. For theming the UI based on custom domain, ACUL is our recommended approach.
In general, however, custom domain (and Organization) variables are supported parameters in information available in Actions.

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Hi Marybeth, thanks for the question.
Passowordless login could be enabled on any number of domains. However, auth sessions are not shared across the domains. The access to the backend resource server through the second domain will be possible once a session is established to it.
If using Passkeys, different passkeys will be stored for the different domains. Support for the ability to use a single passkey for authentication over all domains through passkey related origins is under evaluation.

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Hi Remus, thanks for the question.
Different domains require different sessions to be established (at least once per domain).

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Hi Dawid, thanks for the question.
Multiple Custom Domains capability is available only to Enterprise customers. A base entitlement of 20 custom domains per tenant will be available to Enterprise customers. Additional # of custom domains could be purchased through an add-on SKU.

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Hi Vlad, thanks for the question.
Advanced Customization for Universal login (ACUL) and email templates will support a high degree of customization, including logos, colors, etc. based on the custom domain info. Auth0’s error pages have a standard presentation. Customers are able to customize their own error pages for certain errors, but custom domain info is not available for this purpose as of now.