Error adding second vRPA

Hello,

I deploy successfully the vRPA cluster with the first vRPA. EcoverPoint for VM version is : 5.3.SP2.P2(m.154).

When I add the second vRPA in the web console RecoverPoint for VMs Deployer, the second VM is detected (status ok). But when I add it I have the error below : 
    Failed : To Add RPA/s 400 (progress remaining on starting 0%).

Could you please indicate how to solve this error ?

Regards,
E. Perez