Yamaha RX-V781 - Airplay 1 doesn't work when a password is set

[past spear]

I just found that I had to remove the configured AirPlay password to enable MA to send streams to my Yamaha RX-V781 AVR.
I did have the correct password configured in the MA Player settings, but it didn't work.
Logs showed ... oh, went to get the log entry errors and they have been rolled over already. From what I remember it was a 401 error - no mention of password being passed or rejected.

[true remnant]

You can get the full,log by downloading it. You don’t say which AirPlay version you are using but there are open issues for this.

[past spear]

The downloaded log was the same as what showed in the log viewer screen.
The RX-V781 only supports AirPlay 1.

[true remnant]

And you downloaded it from the Music Assistant settings?

[past spear]

Yes, here: