Matter Server add-on fails to install immediately

I’ve tried adding the Matter Server Add-on a few times and it fails. The first few times it seemed like it had started installing, but now it fails immediately.

[homeassistant.components.matter] Matter Server add-on is not installed. Installing add-on
[homeassistant.components.matter] Matter Server add-on is not available anymore

What can I do to figure out what’s causing the failure?
Running this instance on an older Raspberry Pi 3B+ but not sure if that’s the issue.

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