internet radio troubleshooting--omni app

unsure if I'm posting in the right place or if anyone can help, but...

I'm using the omni app to run audio to six SB1 speakers. when it works, it's great.

there are three internet stations which won't work through the app. I can search for them and they show in the radio list, but if I click to play either nothing happens or I get the message:
'Error Starting Playback
this file is forbidden.'

the stations work on other devices, but won't work through the app, so I'm unable to stream them. I'm wondering if the link to the stations in the app is broken, but don't know how to troubleshoot that.

can anyone duplicate/help/make suggestions?
thanks in advance.

stations:
Paul in rio radio
Paul in rio blue Bossa nova
Paul in rio brasilectro

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