Can you send me any links how can I solve it? :/

Hi @wariat . I tried to recreate a "New User" Registration to see the exact auto-generated email that it sends.

Comparing your screenshot with mine, (I'll attach it below too), I see and have noticed that the "<" and ">" on my link is not clickable, and the rest of the link is clickable.

From your screenshot, I have noticed that the "<" and ">" is part of the link itself.

Here's some things to consider:

1) I agree with @anonymous20, and @anonymous3542 - that the invalid key error might be caused by encoding.

2) And to add to that, I have noticed that you are using a "translated version" of WP / wpForo. (In Polish?)

3) You might want to check the flow of the translations (and look for the corresponding files) because the error might have come from the translation with the placeholders "<" and ">" erroneously added to the autogenerated password key field.

1. You can also check what's on:
2. Forum Dashboard
3. Phrases

4) Another area you can check is your

1. Forum Dashboard
2. Tools
3. Debug tab

5) Then look at your Debug Information
specifically: 

• Server
• Errors & Issues

6) You can check your own php version (WP is using php) and compare it to the wpForo Server Requirements here:

https://wpforo.com/docs/root/wpforo-installation/server-requirements/

which should be at least PHP version 5.6 or higher.

7) In the mean time, until you find the solution to this autogenerated link, I suggest that you temporarily use the WP Reset Password Page URL and then test that, if that works for your password reset links.  

You can do that by going to:

1. Forum Dashboard
2. Settings
3. Select the "Features" tab
4. Replace Reset Password Page URL to Forum Reset Password Page URL
   Select NO

While it is Wordpress core that sends the email to the user, you might want to check this route as well, so we can rule out whether the error is coming from the WP "translated version", or the wpForo translated version or your current php version.

Please let us know what you find.

I hope this helps. Good luck and God bless you. :-)

You'll need to configure it, but it has wizards that make the process simple. It's also very reliable.

I have installed WP Mail SMTP and the same thing happend. For now it's possible to use this link in GMAIL (but it also comes with < and >), but it's impossible to open it in different mailboxes. The same error appears: "invalid key".

Out of curiosity, can you try Post SMTP ?

Do I have to setup it somehow, or just install?

@wariat I think what may be causing the issue here is the mechanism that sends the emails, and not the recipient client. Are you using the native WordPress email functionality, or a plugin such as Post SMTP ?

I'm using only clean WP + WpForo, no more plugins related to mails.

@wariat I think what may be causing the issue here is the mechanism that sends the emails, and not the recipient client. Are you using the native WordPress email functionality, or a plugin such as Post SMTP ?

But there seems to be no issue with WP formating, since those "<>" is what i also get but the links open very well.

Maybe it could be a browser issue ?