A method, comprising: receiving (62; 102, 105), at a Master eNB, MeNB, (10, 900), a Closed Subscriber Group, CSG, ID associated with a Secondary eNodeB, SeNB, cell that is proposed to be added to a Secondary Cell Group of a user equipment, UE, (30, 1000) and a CSG Membership status of the UE relative to the CSG ID, wherein the CSG membership status for the UE determines whether the UE is member or non-member of the CSG; determining (64; 102, 105), at the MeNB, if the SeNB cell is operating in a closed or hybrid access mode; in response to determining that the SeNB is operating in the hybrid access mode: - performing (106, 108), at the MeNB, an SeNB Addition procedure by sending an SeNB Addition request including a new CSG Membership Status Information Element, IE, to the SeNB to add the SeNB cell to the Secondary Cell Group of the UE, - upon the SeNB trusting the UE and accepting it as a CSG member, performing, at the MeNB, a Radio Resource Control, RRC, reconfiguration of the UE to enable it to communicate with the SeNB and to enable dual connectivity between the UE and the SeNB before verifying the CSG Membership status of the UE; - when the RRC reconfiguration is complete, informing (114, 116), from the MeNB, the SeNB to allow the UE to access the SeNB, and - thereafter, requesting, from the MeNB, a Mobility Management Entity, MME, to verify the membership status of the UE for the CSG-ID reported by the UE, if the respective result is not yet available at the MeNB from a previous SeNB Addition procedure and receiving (118, 122), at the MeNB, from the MME, the CSG membership status of the UE to verify the CSG Membership status of the UE relative to the CSG ID. receiving (62; 102, 105), at a Master eNB, MeNB, (10, 900), a Closed Subscriber Group, CSG, ID associated with a Secondary eNodeB, SeNB, cell that is proposed to be added to a Secondary Cell Group of a user equipment, UE, (30, 1000) and a CSG Membership status of the UE relative to the CSG ID, wherein the CSG membership status for the UE determines whether the UE is member or non-member of the CSG; determining (64; 102, 105), at the MeNB, if the SeNB cell is operating in a closed or hybrid access mode; in response to determining that the SeNB is operating in the hybrid access mode: - performing (106, 108), at the MeNB, an SeNB Addition procedure by sending an SeNB Addition request including a new CSG Membership Status Information Element, IE, to the SeNB to add the SeNB cell to the Secondary Cell Group of the UE, - upon the SeNB trusting the UE and accepting it as a CSG member, performing, at the MeNB, a Radio Resource Control, RRC, reconfiguration of the UE to enable it to communicate with the SeNB and to enable dual connectivity between the UE and the SeNB before verifying the CSG Membership status of the UE; - when the RRC reconfiguration is complete, informing (114, 116), from the MeNB, the SeNB to allow the UE to access the SeNB, and - thereafter, requesting, from the MeNB, a Mobility Management Entity, MME, to verify the membership status of the UE for the CSG-ID reported by the UE, if the respective result is not yet available at the MeNB from a previous SeNB Addition procedure and receiving (118, 122), at the MeNB, from the MME, the CSG membership status of the UE to verify the CSG Membership status of the UE relative to the CSG ID. - performing (106, 108), at the MeNB, an SeNB Addition procedure by sending an SeNB Addition request including a new CSG Membership Status Information Element, IE, to the SeNB to add the SeNB cell to the Secondary Cell Group of the UE, - upon the SeNB trusting the UE and accepting it as a CSG member, performing, at the MeNB, a Radio Resource Control, RRC, reconfiguration of the UE to enable it to communicate with the SeNB and to enable dual connectivity between the UE and the SeNB before verifying the CSG Membership status of the UE; - when the RRC reconfiguration is complete, informing (114, 116), from the MeNB, the SeNB to allow the UE to access the SeNB, and - thereafter, requesting, from the MeNB, a Mobility Management Entity, MME, to verify the membership status of the UE for the CSG-ID reported by the UE, if the respective result is not yet available at the MeNB from a previous SeNB Addition procedure and receiving (118, 122), at the MeNB, from the MME, the CSG membership status of the UE to verify the CSG Membership status of the UE relative to the CSG ID.