@Mateus-Costa, thank you for reporting this problem, and for testing because I can't reproduce it here.
When you say you've seen others with the same problem within the last weeks, do you mean other Alexa skills are having the same problem?
Also, can you confirm you can't link any of the TRIGGERcmd skills, including the "TRIGGERcmd Smart Home" and "TC" skills?
I'm trying to think of how I can simulate coming from Brazil so I can reproduce the issue. I tried using NordVPN to come from Brazil, but it linked fine for me.
I also opened a ticket with Alexa support on this.
Please let me know if it starts working.