This was working so something has changed during a recent update.
I have a Custom Role which has; list users, edit users, create users capabilities, but they can no longer see the Role drop down option when they are logged in as my custom role and look at Users > Edit in the backend.
Yes - I created a new role copy from "administrator" and I see role dropdown is not displayed on edit user profile page. Please allow me to consult our devs and I will get in touch with you as soon as I know more.
When I created the new custom role using "copy from administrator" - the capabilities you listed is already assigned by default to the role:
list users, edit users, create users capabilities
I've created the custom role "custom-admin" (copy from "administrator") as well as "custom-editor" (copy from "editor") and created new user for each of these roles.
Then I logged in as a user having "custom-admin" role and I try to edit the user having role "custom-editor" and I can see the "Role" drop-down is displayed on that profile. I am not able to reproduce this issue.
No, that appears to be what I would have done (albeit some time ago now so I can't remember all the steps I took).
This was working but seems to have been knocked out very recently by an update.
It's being used in the day time... tonight I will disable the Access plugin and see if Role re-appears... this will at least then definitely tie it down to the Access plugin.
In the access plugin, in Custom Roles > Change permissions > General capabilities, you now need to tick promote_users (I think this may be a new option?)
Underneath it says 'No info', can I put in a request to have this changed to 'Change role' or similar.
I was fairly certain that I copied the Administrator role - but I could be wrong.
The Role drop down was available BEFORE a recent update (it's been used for well over a year), so an update knocked this out.
As it's now resolved I'm happy to close this call though. Thank you for all your help and thank you for adding the request to add the "promote_users" capability information.