If you are an sole proprieter, you can use your SSN as your EIN.
Of course that raises the issue of whether you should provide something like that... but that's a whole other issue.
Discussion
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The given fields don't look like it will accept a SSN. Ugh.
It should still be 9 characters but with the hyphen in the wrong space. Just ignore the hyphens. If it accepts it you should be fine. If not, that may be a shortcoming on the strike api side of things.
Alternatively it's relatively easy to get an ein assigned. Submit form SS-4 with the IRS.