Philippe Signoret

Thanks for this pull request! Do you forsee any issues with the fact that I've taken firebase/php-jwt (under lib/php-jwt), prefixed the original namespace with "AADSSO/", but left it's original composer.json...

I'd like to better understand how this would be used. Can you give me an example scenario where this would be useful?

So, taking a step back from the implementation, your goal is for users from more than one organization to be able to sign in to the block, right? Perhaps two...

Just filtering the credentials shouldn't be enough, unless you have a rather strange app setup. Can you share how you've set up the app in the different Azure AD tenants?...

Have you been able to reproduce this issue on a completely fresh browser session (e.g. Chrome's Incognito mode)?

How have you configured the plugin?

I agree! I would enthusiastically welcome a PR with an initial [readme.txt](https://wordpress.org/plugins/readme.txt).

Is the user a regular local user of the Azure AD tenant? Or is the user an external user (e.g. from another tenant or a personal Microsoft account)?

I've reviewed this part of the code, and found that if the app registration in Azure AD is missing the required permissions, the plugin will report this as "user is...

@mrjarbenne Thanks for this great feedback. This is definitely something we can consider for a future release.