Script blocked by the browser on the login page

Script blocked by the browser on the login page

We are experiencing the following issue:
When users are logging in, the browser does not load the required script and just hangs there. If the user refreshes the page (F5), they are already logged in and can continue.

This has been tested with multiple browsers - screenshots from Chrome and Edge are attached.
The ADSS build number is 5600

Has anyone had this before - any ideas?

Thanks

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