The signup page for DevNet is “weird”.
I try to link my Cisco account, I fill in the field (and check the boxes not shown in the screen shot)
When I click submit to bring me back to the same page, moves my last name from the last name field to the first name field, and tells me that the form is wrong as the last name field is empty.
Any ideas?
Hello!
If you look under the username, it has a javascript validation that username must be characters or numbers. There is a period in the username. Try removing the username and submitting. Hopefully this helps 
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