(Solved!) This forum blocks me from posting in a thread, saying "CSRF validation failed"

Hello there,
and thanks for any help!

I have been trying to reply to a thread in this forum, but every time, i get denied:
"Request blocked. CSRF validation failed.
If this error keeps occurring please contact support and give them this error code: 29b778a4fd9fd4db0f8ef176ec0f2e1c"

I am using Firefox 132.0.2, on Pop Os (which is based on Ubuntu).

Some testing i did:
- i found out i can not even post "test", so probably its not about the post content.
- I disabled most extensions temporarily, only leaving Privacy Badger and ublock origin active. I assume i am not the only one using these, therefore dont expect them to be the problem.
- I have never had this error message anywhere else in the internet before.
- I could post in the poe2 early access announcement thread.
- Edit: And i could post this thread. ;)

Oh wow, you are correct. With the correct link i can post.
Thank you!!

Not important, just wondering:
Curious i had the wrong link - pretty sure i came through google, but its an older bookmark, so i dont remember.
And why is that wrong link working to display the thread?

thanks!