Update:
We started an investigation and found that SayIntentions specifically was blocked by SimBrief based on traffic patterns originating from their servers. We have applied a temporary solution to unblock the traffic, and are working towards a more permanent solution together with them!
At the moment, everything is up and running again.
If you are seeing a similar issue outside of SayIntentions, the cause is different! Please post in a dedicated topic.
Best Regards,
Malte