Make sure that both following roles allowed to that custom group and also double check whether group has assigned the same role.
Hello @Vanessa J.
Does custom role assigned to the management role?
A user group specifies exactly one role to manage AppMon Servers. Roles applied to management only grant access to AppMon Server. AppMon ignores other permissions contained in this role, such as those for a specific System Profile.
Review / follow the below link and share the result with us.