macOS Sequoia beta external startup drive "out of date"

Developer Tools & Services Apple Developer Program
pde5i OP
Created Aug ’24
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Getting alert "The version of macOS on this startup disk is out of date" for a Sequoia 15 beta

  • 8/8/24 installed and used macOS Sequoia on an external drive (on Apple Silicon)
  • Since then, updated main OS (also on external) to 14.6.1
  • No changes to external drive mounts or availability
  • Now unable to switch startup disk to macOS Sequoia

I see no other comments on the forums about this. Anyone else? Any tips? Would it be better on the internal drive?

It's a fair bit of time to install and configure; I'd hate to think any update bricks all that.

(Surprised/confused not to find forum tags for the beta systems, macOS, etc?)

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pde5i OP
Aug ’24

As another data point, this is on an external drive with two volumes, and the other volume has 14.6.1 installed.

Seems like a serious issue?

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macOS Sequoia beta external startup drive "out of date"
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