iPad sidecar and iPhone mirroring at the same time stopped working with Tahoe

Try Sidecar with the iPad connected via cable instead of wireless. Does that work?

(Note: I cannot test iPhone mirroring due to stupid regulations, I'm in the EU; but a similar problem occurs with continuity camera, and connecting the iPad with cable does work, so this may also be the case with iPhone mirroring)

So do you plan to file a bug report or not? Link provided in the response above.

Camateis wrote:

I was able to use Sidecare and iPhone Mirroring at the same time without issue in Sequoia. Why the heck did it stop with Tahoe??? Will Apple be fixing that? Please do so!

The current stable release of Tahoe including bug fixes, security updates is macOS 26.0.1

Keep your Mac up to date - Apple Support

Keep your Mac up to date - Apple Support

The current stable release of iOS including bug fixes, security updates is iOS 26.0.1

Update your iPhone or iPad - Apple Support

To be proactive you can file a bug report / submit your Apple Feedback here: Product Feedback - Apple