I've made the custom adminhtml theme and changed the login logo and the default top left logo on dashboard, however I'm unable to change the admin favicon.
In the default.xml that I'm using to modify the header logo i have added
<head>
<link src="images/favicon.ico" rel="icon" sizes="32x32" />
</head>
to call a custom favicon that is stored in the app/design/adminhtml/%vendor%/%theme%/web/images/ folder but even though the logos have loaded fine, the favicon remains the same as the front-end.
is there a different string i should be using in the ? i have taken this string directly from the frontend favicon tutorial, so don't know what it would need changing for the adminhtml sections
I have also tested this in the default_head_blocks.xml but that appears to be front-end specific.
Edit:
It appears that the theme is active, (can change .phtml files successfully) but the default.xml and the admin_login.xml are both being ignored anyway. if i remove those files, the logo files with the default names load fine, but with the files in place the newly linked files from the xmls are ignored.