Sometimes Verizon email arises issues while signing in due to some reasons. Here is the list of reasons and corrective measures.
Ensure the internet connection is fine or you can restart your router as well.
Recheck the credentials
Also you can switch the browser, sometimes browsers also do not respond in favor of the email.
Use incognito mode this helps in login as a raw browser.
You can clear cache, cookies, and browsing history also.
You can disable the security system on a temporary basis