It's much easier to communicate via email at this time.
I followed below instructions that is included in reservation confirmation email, then received my permit in 15 minutes.

To request your permit by Email send the following information to: SM.FS.WildPmt_Inyo@usda.gov

Subject line: [Entry Date] Trail Name [Reservation Number]

In your message answer the following;

Have you viewed the Leave No Trace video?
How you will store your food?
What is your final group size?
Or call the visitor center nearest your entry trail, or the wilderness permit office: