Good it worked now, thanks for the feedback.
Below the flowchart of the boot process of a Unified AP. Should be done the DHCP based discovery before getting into instant controller mode.
My slide is from the ACMX training guide and it's true for every out-of-the-box or factory default Unified AP.
Don't know the source of your slide but it's possible true when your Unified AP is already deployed in instant cluster mode before.
When have issues with AP deployment it's recommended to perform a factory-reset from the CLI.
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