Hi Lin,
I have already done that and here is the outcome of the last command line
Get-CsHostingProvider -LocalStore
Identity : LyncOnline
Name : LyncOnline
ProxyFqdn : sipfed.online.lync.com
VerificationLevel : AlwaysVerifiable
Enabled : True
EnabledSharedAddressSpace : False
HostsOCSUsers : False
IsLocal : False
AutodiscoverUrl :
Identity : Exchange UM
Name : Exchange UM
ProxyFqdn : exap.um.outlook.com
VerificationLevel : UseSourceVerification
Enabled : True
EnabledSharedAddressSpace : True
HostsOCSUsers : False
IsLocal : False
AutodiscoverUrl :