Issue with Logging into Messages & FaceTime on macOS 15.1 – Endless Spinning Wheel

I'm experiencing an issue on my MacBook Air (macOS 15.1) where I can't log into Messages or FaceTime. Whenever I try, I just get an endless spinning wheel. I've already tried the following troubleshooting steps without success: Resetting NVRAM Changing networks Logging in and out of iCloud Force quitting the apps Restarting my computer. Has anyone encountered this before or found a solution?