In what way does it not work?
I have the url to the admin page in the search bar but nothing happens- the screen stays blank
Please provide a link to a page on your site where we can see this. Thanks.
Errors like this are logged. Check the error log on your server. If you can’t find the log, please contact your host.
Meantime, enable wp_debug and wp_debug_log and after an error, look at wp-content/debug.log to see if anything gets logged there. https://wordpress.org/support/article/debugging-in-wordpress/
You can also try this: Please attempt to disable all plugins, and use one of the default (Twenty*) themes. If the problem goes away, enable them one by one to identify the source of your troubles.
If you cannot access wp-admin, there are other ways to deactivate plugins.
OK – thanks Steve. I’ll work through your suggestions and see how I get on.