Roku 4K streaming stick not playing 4K on projector?

I have a Magcubic projector from Amazon that has 4K compatibility, and I recently purchased the Roku 4K streaming stick. I have the Roku plugged into the HDMI port on the back of the projector and it is working, however it’s not playing in 4k? The projector automatically detects it/plays in 1080p, and I go into the display settings and it shows 4k as an option, however it says it’s not compatible. Am I doing something wrong?