How can I control which group has access to the CommerceManagerLink menuitem?
Currently its only the Administrators group that can see the CommerceManagerLink.
We have tried using and add our new group into the Allow element, but this didnt work.
We are also currently using MultiplexingMembershipProvider and MultiplexingRoleProvider, with this setup "provider1="SqlServerRoleProvider" providerMap1="SqlServerMembershipProvider" provider2="CustomerRoleProvider" providerMap2="CustomerMembershipProvider"". The same setup is used for the membershipprovider :)
If I remember correctly it's controlled by virtual role CommerceAdmins, default mapped to roles WebAdmins and Administrators.
Take a look at the virtual roles section in EPiServerFramework.config.
To access to CommerceManagerLink, the user must have access to Admin/SitePlugin path, which by default grants (only) to CommerceAdmins (in web.config/configuration/location).
CommerceAdmins is a virtual role, which by default, includes WebAdmins and Administrators (configured in episerver.framework/virtualRoles/providerS) as Mari mentioned.
You can change either setting to add new role to get access to the link.