Can't edit first post in topic

I can’t seem to be able to edit the first post in this topic. I can see the edit symbol on my next post (number 7) but no edit button for the original one. Is it because the post is too old (just guessing)? I want to update the link in the original post.

I can edit the title but not the post.

There was time limit for editing, I changed it to be available forever:

Privacy. Security. Freedom