Prototype Not Loading In Browser?

When attempting to test prototypes in browser, the Figma loading screen appears but will not load the prototypes. The following appears in the console:

Failed to load resource: the server responded with a status of 401 ()
https://www.figma.com/api/files/fnzRU85nTaNQrBt2J9tKps/prototype/view

Each prototype I’m testing is responding with the same console error, but each worked prior to today. I’m not sure if I’ve unknowingly broke something or if this is a bug others are experiencing.