AirPlay on iMac Late 2008 after update with OCLP not working

AirPlay on iMac Late 2008 after update with OCLP not working

Before updating to macOS Monterey on my iMac Late 2008 I was able to either connect to my HomePod mini via AirPlay in iTunes or to select the HomePod as the general audio output. (I was on ElCapitan)

Now after updating with OCLP to macOS Moneterey the HomePod shows in Apple Music but doesn't connect. (The "AirPlay device can not be found. Please verify your network settings etc." error)

And in System Preferences under Sound it doesn't show up at all. What can I do? Please help me!

The error

submitted by /u/billgateseatskids
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