Hello,
I only help on forums so any Gameflip related internal matters I won’t know about them.
Have you tried using another Email address to see if it works? If it does, then try to revert back to the current Email that you are using to see if it works.
If it doesn’t, then will have to wait for MajorTom/DarkKnight to reply you.
Reference - GF deleted my existing email and keeps asking me to add one
Do submit a ticket to Support regarding it.
https://gameflip.zendesk.com/hc/en-us/requests/new