Microphone problems on a MacBook with a Sequoia 15.5

English:

👋 Hello, thanks for participating in Apple Communities in Spanish 

From what you tell us, the problem is that your microphone shows failures when the Mac is put to sleep.

The problem may be due to a software and/or settings issue, so I recommend that you check the following:

1. From Settings under Sound, check that the entry is something like this: "MacBook Pro Microphone - Built-in"
2. From Settings under Lock Screen, check that the options under Accessibility Options are all disabled, and check to see if any yellow triangle alerts are displayed ⚠️ about any incompatible settings.
3. Try uninstalling software and drivers that might interfere with the MacBook Pro's microphone.
4. Try booting the Mac in safe mode, to check if it is a problem with macOS or third-party software.
5. Try reinstalling macOS
6. Contact Apple Technical Support to assess a hardware failure.

https://www.youtube.com/watch?v=tPhI3LgEYn8

Also if you feel more confident, you can reach our Community in English here: Official Apple Support Community

🙂 I hope I have helped you and I remain at your disposal for further questions

Español:

👋 Hola, gracias por participar en las Comunidades Apple en Español 

Por lo que nos comentas, el problema es que su micrófono muestra fallos al ponerse el Mac en reposo.

Puede que el problema sea debido a un tema de software y/o ajustes, por ello, le recomiendo que revise lo siguiente:

1. Desde Ajustes en el apartado Sonido, revise que la entrada es algo así: "Micrófono del MacBook Pro - Integrado"
2. Desde Ajustes en el apartado Pantalla de Bloqueo, revise que las opciones en Opciones de Accesibilidad están todas desactivadas, y revise si se mostrara alguna alerta con un triángulo amarillo ⚠️ sobre alguna configuración incompatible.
3. Pruebe a desinstalar softwares y drivers que pudieran interferir con el micrófono del MacBook Pro.
4. Intente arrancar el Mac en modo seguro, para comprobar si es un problema del software de macOS o de alguno de terceros.
5. Pruebe a reinstalar macOS
6. Contacte con el Soporte Técnico Oficial de Apple para valorar un fallo de hardware

🙂Espero haberle ayudado y quedo a su disposición para otras dudas

Hello again,

If you already checked the provided information and ruled out hardware issues, I would recommend to run the Mac diagnostic. Later, if you don't find any issue with the diagnostic result, I would recommend to reinstall macOS as you told us.

Apart from that, I understand your are thinking on installing a macOS beta on your Mac. I would not recommend that, the beta software from Apple it's only recommended for not primary devices, as it may contain bugs or other problems that can make your computer to loss data and other issues.

“Install beta software only on non-production devices that are not business critical. We strongly recommend doing so on a secondary system or device, or on a secondary partition on your Mac.” - Apple Beta Program

I send you some documents that you can follow easily to run diagnostics on your Mac: Use Apple Diagnostics to test your Mac - Apple Support

And also, this other document for reinstalling macOS: How to reinstall macOS - Apple Support

🙂 I hope I have helped you and I remain at your disposal for further questions