I'm sorry to hear that you're having trouble logging in. If you got an error that you couldn't be authentified when trying to sign in via email, this issue is usually caused by temporary network issues or browser extensions.
Could you please try signing in again using this link? https://school.gdquest.com/auth/otp
You can enter the same email you used for your Mavenseed account (this platform).
If the issue persists, could you please try signing in again using a different browser or an incognito window?
If you're still having trouble, let me know and I'll do my best to help you.