Cannot provision storage due to error:No storage agent for symmetrix
when you go to agents view and look at the symm agent, you see no symms responsible for that agent?
go to that symm agnet box and run
make sure you see the symms in question.
also check the gatekeepers on that host
make sure you have at least 10-12 gatekeepers on that host to the symm.
If you are still having issues, feel free to open a Service request with eccc support