I am encountering issues in integrating AEM with Target.
After creating a functioning IMS Configuration in Target, I have created the following Target configuration using my IMS Configuration:

But when I try to Connect to Adobe Target, I receive the following result:

I then proceeded to go and look at the logs, and it seems the end point that gets called is the following (the red part is the client code):

So basically https://mc.adobe.io/[client_code]/target/mboxes.
Which returns an error. Now I have verified that the client code is correct, so I am now wondering whether the whole endpoint might be wrong.
I have verified as well that the /target/mboxes part is hardcoded, so it's not like I can change it... but I am still wondering if there's a clear mistake I am making with this integration.
Thank you always for you support,
Parag.