yes it must be installed on all sites
example:
3 sites
site1
in iojT config u must have site2 and site3
site2
in iojT config u must have site1 and site3
site 3
in iojT config u must have site1 and site2
make sure your login u use have right ips added on all site
check error.log if any msg about host not added
if u get transfer failed it means that bot cant connect to site u are trying to transfer too
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