Problem with OpenBullet Proxies

I have imported fully valid proxies from webshare.io. However, it says that all the proxies are invalid in OpenBullet.

Format I used:
ip:port:username:password

Success Key:
title>Google

Test On:
https://google.com

Proxy Info:
Protocol - HTTP
Authentication Method - Username/Password
Connection Method - Direct Connection

Thank you.

Are you referring to OB1 or OB2?
Do you maybe have to bind your IP to the proxies in the dashboard of the website?