Auth0 ACUL doesn't allow for customization of `mfa-otp-challenge`

nik.baleca
Wed, 11 Feb 2026 18:43:39 +0000

Hi again @mike.huebner

I will need some extra time in regards to investigating the customization flow of ACUL. Basically, since it is designed to offer full control over the customizations of UL, it is intended to build the customized screens and prompts from scratch. I will provide some clarifications on the flow once I complete the tests on my side.

Otherwise, if you are using Auth0 CLI, you can run the auth0 ul customize in order to open a live editor for all of you available screens and prompts. Please take into consideration that both of these features require you to have an active Custom Domain on your Auth0 tenant.

Once you run the command, please select the Standard mode since the Advanced one will be deprecated on 2026-06-15 even though it is recommended for full customzation and granular control.

You will be able to add a custom link as you have mentioned above, however, it will be outside of the designated widget of the selected prompt/screen.

Please let me know if the proposed solution is useful for your use case at this time or if you wish to continue with ACUL so I can provide as much information as possible regarding its configuration.

Kind Regards,
Nik