Hi @Tony Yip
Thank you for posting your query on Microsoft Q&A.
I understand that you are trying to add a link to update MFA phone number by adding a custom link "update MFA phone number" next to the forget password link. The link should trigger the new edit MFA phone number policy.
On this page, users can verify their phone numbers (by using text or voice) during sign-up or sign-in.
Follow the code document to "Update MFA Phone Number": https://github.com/azure-ad-b2c/html-templates/blob/main/templates/AzureBlue/multifactor-1.0.0.html
Follow the document for sample templates for UI customization: https://learn.microsoft.com/en-us/azure/active-directory-b2c/customize-ui-with-html?pivots=b2c-custom-policy#sample-templates
Hope this helps. Do let us know if you have any further queries
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Thanks,
B. Siri Chandana