Airplay Screen Mirroring only receiving but not transmitting

aMerrittcw,

You may find some helpful details regarding the requirements and a note that may pertain to the situation here: System requirements for Continuity on Mac, iPhone, iPad, and Apple Watch

On here it'll help to note:

"AirPlay to Mac works best with these devices and operating systems.

• MacBook introduced in 2018 or later
• MacBook Pro introduced in 2018 or later
• MacBook Air introduced in 2018 or later
• Mac mini introduced in 2020 or later
• iMac introduced in 2019 or later
• iMac Pro
• Mac Pro introduced in 2019 or later
• Mac Studio"

As the 2015 Mac is outside of that range it will help to note the following to check on:

You can AirPlay to Mac at a lower video resolution from older iPhone, iPad, and Mac models and operating systems if the supported Mac has the AirPlay Receiver setting in Sharing settings configured to allow AirPlay for either Everyone or “Anyone on the same network”.

Cheers.

Hello aMerrittcw,

Thank you for reaching out to Apple Support Communities.

Do you see this symbol when playing videos:

"Play movies and more on the big screen

It’s easy to play movies, TV shows, and videos on the big screen of your TV. On your Mac, open the Apple TV app , start the show, click  in the playback controls, then select your Apple TV or smart TV. See Control what’s playing in the Apple TV app on Mac.

"

More details can be found here: Stream audio and video from your Mac with AirPlay

If so, and the issue persists, can you provide a few more details? Which devices are you trying to AirPlay to? Also, do you know if those devices are compatible with AirPlay 2?

Cheers!