Are you using any plugins that might be causing a conflict with the registration and activation process?
		
	 
	
	
	
 
		
			
	
	
		
		i deactivated all plugins. but the issue is still there.
do you know path to the activation function? then i can fix it by my own. 
or do you have other ideas?
		
	 
	
	
	
 
		
			
	
	
		
		congratulations! you’r a member
This message doesn’t exist in BuddyPress.  Are you using any custom code snippets in wp-content/mu-plugins or wp-content/plugins/bp-custom.php?
		
	 
	
	
	
 
		
			
	
	
		
		yes i know. and actually there is not this massage. “congratulations! you’r a member”
i just wrote it to understand my problem.
here are two screen shots to see what is wrong.
this doesn’t work:


this one works:

the result with the key parameter in url:

		
	 
	
	
	
 
		
			
	
	
		
		all images again. i don’t why the forum doesn’t load the images. so i post the raw link.
without key parameter:
https://ibb.co/cHuSWo
with key parameter:
https://ibb.co/e3vZBo
activation:
https://ibb.co/k0thxT
		
	 
	
	
	
 
		
			
	
	
		
		push.
has somebody an idea? what is wrong? and why?
i could edit the core activation function.
so which file and class/function will activate the user?
		
	 
	
	
	
 
		
			
	
	
		
		The code to activate a user can be found here:
https://buddypress.trac.wordpress.org/browser/tags/3.1.0/src/bp-members/screens/activate.php?marks=98#L62
https://buddypress.trac.wordpress.org/browser/tags/3.1.0/src/bp-members/bp-members-functions.php#L1798
It would be great if you are able to set up a fresh install of WordPress and BuddyPress to see if your activation problems are because of some custom code on your site.
		
	 
	
	
	
 
		
			
	
	
		
		Thank you for you help guys!
i installed wordpress and buddypress new. There is still the same issue.
any idea?
		
	 
	
	
	
 
		
			
	
	
		
		i found the reason 
in https://buddypress.trac.wordpress.org/browser/tags/3.1.0/src/bp-members/screens/activate.php?marks=98#L62
at:line 101
i found the reason. php thinks $user->errors is not empty. but it is.
so $user->errors is empty. as my error_log says
[17-Jul-2018 16:51:26 UTC]  error activte : 
cheers pauapau
		
	 
	
	
	
 
		
			
	
	
		
		sorry forgot to post the code.
https://pastebin.com/WhAjYBfS
		
	 
	
	
	
 
		
			
	
	
		
		update:
hmm i dont know. but it seems like the $user->errors is empty with var_Dump. but with print_r not.
also in the backend the user is activated when he clicks on the activation link. but $user->errors will give an error. 
error_Log:
[17-Jul-2018 17:27:38 UTC] PHP Notice:  Trying to get property of non-object in /mnt/web313/d2/98/57260698/htdocs/goUnhooked/wp-content/plugins/buddypress/bp-members/screens/activate.php on line 118
[17-Jul-2018 17:27:38 UTC]  error varDump:||
[17-Jul-2018 17:27:38 UTC]  error print_r:|1|
 error_log(" error varDump:|".var_dump($user->errors)."|");
 error_log(" error print:|".print_r($user->errors)."|");
		
	 
	
	
	
 
		
			
	
	
		
		i found the reason. php thinks $user->errors is not empty. but it is.
For your error log, you should use var_export( $user, true ) instead of var_dump( $user ).
		
	 
	
	
	
 
		
			
	
	
		
		thank you r-a-y:)
buddpress adds the invailid-key error at bp-members-function.php:1856
so why it is “wrong”(if ! $wpdb->query…) that $wpdb->query can update the value?
i dont undestand it 🙁
// Change the user's status so they become active.
			if ( ! $wpdb->query( $wpdb->prepare( "UPDATE {$wpdb->users} SET user_status = 0 WHERE ID = %d", $user_id ) ) ) {
				return new WP_Error( 'invalid_key', __( 'Invalid activation key.', 'buddypress' ) );
			}
		
	 
	
	
	
 
		
			
	
	
		
		or maybee not. 
it is not a good idea watch into the code when you drunk to much beer 😀
so ignore the post before.
tomorrow will be a better day to program :D:D