Forgotten password
Nothing arrived? Check your spam folder first, then check you are using the address you signed up with. If you asked more than once, only the newest email works.
The one-time code is not coming
Codes are time-limited, and asking for them repeatedly slows you down rather than speeding you up. Wait a minute, check the phone number or email on your account is still current, then ask once more.
Signed in, but something is blocked
Some actions need a verified email address, and some need your profile completed. If you signed up with Google or a one-time code, you may not have given all of it yet. eBuy will prompt you when you reach an action that needs it.
Signing out of other devices
If you signed in somewhere you should not have, you can end every other session from your profile. It asks for your current password and leaves only the device you are using. Change your password afterwards if you think someone else knows it.
If none of this works, contact support instead of making a new account. A second account cannot take over your orders, saved items, or seller standing.