I cannot update the tenant branding under Azure Active Directory > Company branding.
I have previously created a unique brand, which is now called "Default" under Locale. I can upload new files, but when I save I get the error message "Failed to update tenant branding".
I tried adding another language, but it showed the same fail message.
When I only have one language, I can't seem to remove it (delete button is inactive).
I don't want to have to pay $29 to get Azure support for what is likely a bug (or poorly designed UX).
Anyone with a solution?