A Thread device need to use SRP/mDNS to discover it’s binding peer. I did observe with Matter updates that Thread devices connected via Apple Thread Border routers were unable to find the OTA Provider (update file provider node in Matter), presumably because the Thread node to be updated was unable to resolve the OTA Provider node via SRP/mDNS. So this might be an Apple Thread Border Router issue, but this is a guess right now.
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