There can be one or multiple reasons due to which Verizon email login problems arise. The reason is the commonest of all, but it needs significantly less brainstorming to figure it out. All you need is to check the password or email address you are typing. Check if the casing is correct, or you have enabled the Caps-lock when it is not required. Also, examine the spelling of the email address, username, and password while entering the credentials.