[Resolved] Major Problem: Cannot enter Registration page with received email-link

Hi,
I have the site setup and the payment part works just fine, as well as the email sent to the new member to complete the registration. When clicking on the link, the content of the Registration page is not shown properly and it says, I need to login… catch 22 situation!

I have debugging enabled, and all seems just fine (sitename and ID’s changed):

[04/12/2020 10:41 AM] – SUCCESS: Membership payment paid for membership level ID: 2
[04/12/2020 10:41 AM] – SUCCESS: Transaction type: web_accept. Creating member account…
[04/12/2020 10:41 AM] – SUCCESS: swpm_handle_subsc_signup_stand_alone(). Custom value: subsc_ref=2&user_ip=xx.xx.xxx.x, Unique reference: 44V92865AS7832447
[04/12/2020 10:41 AM] – SUCCESS: Could not find any record using the given email address (xxxxx@gmail.com). Attempting to query database using the unique reference: 44V92865AS7832447
[04/12/2020 10:41 AM] – SUCCESS: Did not find a match for an existing member profile for the given reference. This must be a new payment from a new member.
[04/12/2020 10:41 AM] – SUCCESS: Creating new member account. Membership level ID: 2, Subscriber ID value: 44V92865AS7832447
[04/12/2020 10:41 AM] – SUCCESS: Member signup URL: https://mysite.se/members/membership-join/membership-registration/?member_id=407&code=c4ee1c6c9c24cd84c23568fccd4c1994
[04/12/2020 10:41 AM] – SUCCESS: Member signup (prompt to complete registration) email successfully sent to: xxxxx@gmail.com
[04/12/2020 10:41 AM] – SUCCESS: Saving transaction data to the database table.
[04/12/2020 10:41 AM] – SUCCESS: Transaction data saved.
[04/12/2020 10:41 AM] – SUCCESS: Paypal class finished.

——————————————————————

But then, I cannot login, as my registration is not complete yet. When asking for a new password (via Password Reset page) , I get the email with the link (see below):

[04/12/2020 11:11 AM] – SUCCESS: Member password has been reset. Password reset email sent to: xxxxx@gmail.com
[04/12/2020 11:21 AM] – SUCCESS: After login redirection addon. Checking if member need to be redirected.

but the new password is not accepted, when I try to login with the new credentials. Wow!

I have manually removed the new member and started all over again, and I get the same result, I cannot complete the registration.
I checked the pages for registration and it has the right adress:
https://mysite.se/members/membership-join/membership-registration/
The registration page is protected for this memberlevel. If I remove the protection, my own text is shown on the page, but not the [swpm_profile_form].

So I am out of options. What is wrong here?