HI JP,
i have tried this and i am able to see the AP name changes.. i tried on Instant on 3.0 version which version are you seeing this issue.
also in latest web portal when you do a change and not save, you will see a warning like below

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Dhanasekar Panneerselvam
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Original Message:
Sent: 08-27-2024 09:51 AM
From: JP
Subject: How to change AP name
This does not work. When you hit enter, the name reverts on the app. In the web portal, same problem