Gee, that sucks. I received an IRS rebate on every electric motorcycle that I have bought, going back to my 2009 and 2010 Electric Motorsport GPR-S bikes, which technically didn't qualify for a rebate as I applied as if it was an ICE conversion, since the manufacturer never bothered getting it approved by the IRS. I had no problem getting my 2014 S approved for a rebate. For my 2017 tax return, the IRS credit for motorcycles, which had expired, was reactivated at the last minute by Congress, but the IRS hadn't issued the form for getting the credit when my tax guy submitted my return in 2018. However, he submitted an amended return in July, after the IRS form became available and I received a check from the Treasury department for $1,800 a month or two later. I have never had a problem getting the rebate.
I wonder what changed last year? The SR/F certainly seems to have sufficient battery capacity and its high price should qualify for the 10% rebate. Did Zero forget to file the documents verifying that their motorcycles qualify for the rebate? I seem to recall that last year they were bragging that you could get a 10% credit from the IRS as a way of convincing people to buy one of their bikes.
It might be worthwhile to see what the IRC (IRS?) 30D(g) is all about.