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i've register an user into your forum, but after i've click on activation email link, it still result as not active and can't login phpBB.
so i can try to login WP, but until not active in phpBB, will not be added into WP side.
Is the user you're testing in same condition? Your scenario is: you let register users in phpBB, so until they aren't active, aren't added into WP when as logged come to visit, or login, WP side.
Is this maybe the problem?

[EDITED]
p.s i've yesterday close the pc just after this reply, opening today so i just need to precise:
i've see that your example user on video is logged, but mine not, so after registration test, i've write the report of what happen.

Wordpress does not create a new user :shock:
https://youtu.be/T8HA7wCWyNw
HTTPS and cookie and domain are well configured
https://www.youtube.com/watch?v=kiYljcVF5Fg

nice trip looking your video! I like the way you've shown the problem :D
It look like that the user isn't recognized into WP side due to one of the following facts maybe:
1) the cookie isn't recognized in WP, to check this, you can try to login the user in WP and see if in this case the user is correctly added/logged.
2) http/https: the forum is under http, while WP is forced under https: force phpBB to be https also than, and login as https in phpBB than try to go to WP side (also https), than the cookie will be recognized (this is a normal behavior for cookies).

Have you setup as explaine on help install, the phpBB to be like:
[b].mydomain.com[/b]
and the path to single slash
/

follow what explained on procedure about logout and clean cookies on browser if you change this setting in phpBB:
[url]https://www.axew3.com/w3/2016/02/configure-phpbb-for-cookie-on-subdomains/[/url]
about https/http: if your wp is under http, than also your phpBB need to be http, https if https.

Hello!

The plugin now works thanks. ;)
By cons I still encounter a problem once connected to phpbb. It is impossible to connect to wordpress ..

I made a short video to show you
https://www.youtube.com/watch?v=oZ4qcEpxCNA&feature=youtu.be

i've after re-think this morning about this, and i see that the user, when register in WP, is added in phpBB as normal registered user.
[quote]Pre-defined groups
Pre-defined groups are special groups, they cannot be deleted or directly modified. However you can still add users and alter basic settings.[/quote]
The solution to this, is to change phpBB [i][b]Registered users[/b][/i] Group permissions into ACP.
The result you can see here, when you register, you can post and see any forum, but i could set some hidden based on further forum's permission and so on: in this online example, it's set that any new user, need to have a validated/moderated post, before to post without restrictions on all forums.

[b]So, resuming the answer to this problem should be this:[/b]
it is necessary to setup in [i]ACP -> Group Permissions[/i] the correct setting permissions to match the thing like you want, assuming that the plugin, when an user register in WP, add the same user into phpBB under the [b][i]Registered users[/i][/b] Group.

Hi! about
[quote]When a new user signs up on wordpress, all forums are invisible because he does not add to any group on the phphbb forum.[/quote]
the problem is the one reported into the other post, i will check as soon i can about this.

About the widgets not showing instead, it's a problem that i can't figure out at moment by what can be caused, but after activated widgets, have you try out to switch for a while to a default WP theme like [i]twentisixteen[/i] or one of others WP default themes? What happen?