Symfony\Component\DependencyInjection\Exception\ServiceNotFoundException: You have requested a non-existent service "domain.negotiator". in Drupal\Component\DependencyInjection\Container->get() (line 156 of /mysite/html/core/lib/Drupal/Component/DependencyInjection/Container.php).
I clicked on admin/config/system/google-tag/add and got a WSOD.
I also have the domain module on my system. It also has a domain.negotiator.
Could the problem be that google_tag should prefix it's domain.negotiator to not confuse
You have requested a non-existent service "domain.negotiator"
Found this issue that might be related:
📌
Move the gtag_domain condition plugin to a submodule
Closed: won't fix
Active
2.0
Code
This module does NOT provide a 'domain.negotiator' service so there is nothing to 'prefix' as you suggest.
My current development site running on Drupal 10 does not have the domain module installed and no errors such as you indicate are present. Visiting the admin/config/system/google-tag/add route does not result in a WSOD. A domain condition is not present on this form.
Please provide further details.