SAML SSO + Custom domain

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Hi, In my app https://xxxx.mendixcloud.com/  I create a subdomain (https://customdomain.com) which is working well, I also use SAML module and I have created an automatic redirection on SAML in index.html.  When the app is launched we have https://customdomain.com/SSO which call our internal ADFS, the authentification works well but when the callback URL comes we go back to  https://xxxx.mendixcloud.com/  So I made all the modification on SAML module SP Configuration to be sure that the new custom domain is only in the XML and this time I have an AFDS error message :  "AssertionConsumerService is configured on the relying party trust 'https://customdomain.com' that is a prefix match of the AssertionConsumerService URL 'https://xxxx.mendixcloud.com/SSO/assertion' specified by the request. " So I don't understand why xxxx.mendixcloud.com is still present in term of Callback and how to resolve this issue It's very urgent because we go in production tomorrow  Many thanks
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Did you set the ApplicationRootUrl to ‘https://customdomain.com’?

https://docs.mendix.com/refguide/custom-settings#2-general-settings

Environments > Details > Runtime > Custom Runtime Settings

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