Interactive Avatar 1 Hour Cutoff Issue

Hi,
I have been streaming a HeyGen Interactive Avatar and exactly at the 1 hour mark from streaming.start_time, the streaming is cut off. We've been in contact with HeyGen Support and they handed us a live-kit-avatar webpage with their API Key so that we could reproduce the same issue. Even after using their key, we faced the same issue and started getting 401 Unauthorized exactly 1 hour from the start time. Has anyone faced a similar issue or knows how to solve it?