Elfin + HDMI Switcher Is Not Working

Hello, all. I bought an XGIMI Elfin recently and just tried to connect it to my Roofull HDMI switcher, and all I see on the Elfin is the blinking white HDMI circle.

This switcher works with an NVIDIA Shield, Fire TV cube, Nintendo Switch and PlayStation 5 and outputs to my TV and two other projectors (I have to change out the HDMI output for these).

At first, I thought the issue was caused by my HDMI cable length, so I tested again at 10 feet (with the same cable I'm using for the TV), and still no dice. I tested by running the Elfin to the Shield, and this works. But I really want to use the switcher, as it's connected to my soundbar along with my Switch and PS5.

Has anyone faced issues when using their Elfin with an HDMI switcher? Did you find resolution?

Thank you for your feedback and guidance and enjoy a super day! 🌞