The following is the code...
multichain-cli chain grant 1PhK5DMbDo55wB2MXZ79Agm5MbrJyXivPrTWkE connect
{"method":"grant","params":["1PhK5DMbDo55wB2MXZ79Agm5MbrJyXivPrTWkE","connect"],"id":1,"chain_name":"chain"}
In your code, you are getting all in wrong fields.. {"method":"multichain-cli","params":["boodonkey" etc..
what is the extra "boodonkey:" is doing before the multichain-cli .. Please check and run again..