Adding users to another blog

Good Morning…
I want to make a snippet that when creating a user in a blog add it automatically to another blog (this number 1 always) with the same roll that was created.

For this I am using this:

$ Blog_id = 1;
$ User_id = get_current_user_id ();
$ Role = ‘publisher’;
Add_action (‘user_register’, add_user_to_blog ($ blog_id, $ user_id, $ role));

…..And it does not work,

but if I do this….

$ Blog_id = 1;
$ User_id = 127; // 127 is a specific number of a user that already exists
$ Role = ‘publisher’;
Add_action (‘user_register’, add_user_to_blog ($ blog_id, $ user_id, $ role));

Then yes that works.

Can someone help me understand why the first (generic) solution does not work with:
$ User_id = get_current_user_id (); ?

Read more here: Adding users to another blog

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