It was probably still downloading models. You can check in Settings → Apple Intelligence & Siri - at the top of the panel, it will mention if models are being downloaded, or if you’ve got an unsupported language setup.
If it persists once models are downloaded, submit a Feedback via the Feedback Assistant.
Jimscard
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The first set of open slots filled up quickly. They are working to add more slots in the coming weeks. Remember, this is an early beta.
Source:
https://x.com/markgurman/status/1849968331337630108
It’s a staged rollout over time.
See Gurman’s post: https://x.com/markgurman/status/1849968331337630108
https://x.com/markgurman/status/1849968331337630108
No, that’s not it. It’s just that the available early access slots filled up quickly, and Apple is working to make more available in the coming weeks.
https://x.com/markgurman/status/1849968331337630108
Like any other limited supply thing; there were so many slots available, and they filled up quickly. According to reports, more slots will be opened in the coming weeks. In the meantime, there are other things to test in the release.