We are also having a similar issue. Both the ArcGIS World Geocoding Service and a View (derived from World) are part of our AGOL Utility Services. Security is also set to HTTPS only. However, users are not seeing either the World or our View locator upon login. Additionally, even when the World and View locators are added, they are not enabled for use.
I'm using an Administrator account and not experiencing this issue. However, when I change to my test account, I experience the same issue as my users are reporting. I changed one of my users to include Premium Content - Geocoding to see if that would resolve the issue --- we don't really want to do that because of consuming credits for batch geocoding --- however, there was no change.
There are a mix of versions in use from Pro 2.1.2, 2.3, 2.4.1.