Custom background image and logo does not work when using external login providers

[lrirlu]

Which Umbraco version are you using? (Please write the exact version, example: 10.1.0)

14.3.1

Bug summary

When an external login provider is implemented, it is not possible to configure a custom background image for the login page, cf. this document.

Once the login provider is removed, the configured background appears.

Specifics

No response

Steps to reproduce

1. Implement an external login provider. (I've used MS Entra)
2. Configure a custom background image on the login screen, cf. this document

Expected result / actual result

Expected
The custom background image shows on the login screen and it is also possible to login using the external login provider.

Actual
The default background image is shown and it is also possible to login with the external login provider.

Additionally
Removing the external login provider, e.g. by deleting the plugin from App_Plugins results in the background appearing as expected.

[github-actions]

Hi there @lrirlu!

Firstly, a big thank you for raising this issue. Every piece of feedback we receive helps us to make Umbraco better.

We really appreciate your patience while we wait for our team to have a look at this but we wanted to let you know that we see this and share with you the plan for what comes next.

• We'll assess whether this issue relates to something that has already been fixed in a later version of the release that it has been raised for.
• If it's a bug, is it related to a release that we are actively supporting or is it related to a release that's in the end-of-life or security-only phase?
• We'll replicate the issue to ensure that the problem is as described.
• We'll decide whether the behavior is an issue or if the behavior is intended.

We wish we could work with everyone directly and assess your issue immediately but we're in the fortunate position of having lots of contributions to work with and only a few humans who are able to do it. We are making progress though and in the meantime, we will keep you in the loop and let you know when we have any questions.

Thanks, from your friendly Umbraco GitHub bot 🤖 🙂

[NguyenThuyLan]

Hi @lrirlu , thank you for reporting this issue.
This is really an issue that needs to be fixed, it seems that the custom background currently only applies to sign in with Umbraco and not to pages with external login (v14)