Save Nickname Error (Account Creation)

After the LG account creation you have to enter a nickname for your account.
The verification of the nickname works, but if I try to save it, I get the error “Failed to save!”.

Please share your ID and screenshot at developer@lge.com. Thank you.

same problem, help me pls

Please share your LG account email ID and screenshot at developer@lge.com. Thank you.

same problem as well. email sent.