Looking for logging into the With Phpbb3 site and are not getting the correct working link for it? In such a case, you can use the links given here by searching your desired login page in the search box. If the page is present on our website then you will get all the links related to the With Phpbb3 site. After that you can login as usual with your login credentials.
https://www.phpbb.com/community/ucp.php?mode=login
https://www.phpbb.com/customise/db/extension/quick_login/
https://www.phpbb.com/community/viewtopic.php?t=2448611
https://www.phpbb.de/community/viewtopic.php?t=239740
http://www.inmotionhosting.com/support/edu/phpbb/getting-started-phpbb/phpbb-login
https://stackoverflow.com/questions/25659317/how-to-redirect-guest-to-login-page-instead-of-homepage-phpbb3?rq=1
https://github.com/ForumHulp/loginwithemail
https://www.dreamincode.net/forums/topic/326168-how-to-integrate-website-login-with-phpbb3/
https://docs.oneall.com/plugins/guide/social-login-phpbb/3.1/
https://articlebin.michaelmilette.com/phpbb-cant-log-into-administrator-control-panel/
https://forum.dion-designs.com/t9180/phpbb-32-bridge-for-custom-login/
https://www.pc-erfahrung.de/nebenrubriken/phpbb3/phpbb3-cookies-sid-und-probleme-beim-login.html
http://www.lpi-clan.de/viewtopic.php?t=3550