ADD LTM as a Server To GSLB Server in order to add Vs to GSLB Pool not work!!!

hi guys  I have a scenario for running GSLB(WideIP): 3 vCenter vCenter1 include DNS Module. vCenter2 include LTM(Site-A) Module. vCenter3 include LTM(Site-B) Module. When I want To add LTM(Site...