Being Tricky
The short answer
To find wifi password details for a network you've already joined, look on a device that's saved it.
At a glance
About 25 minutes · Advanced · For Andriod
Key point 1 of 5
Windows keeps a profile, including the password, for every Wi-Fi network the PC has joined.
Key point 2 of 5
Android has had built-in Wi-Fi sharing for years.
Key point 3 of 5
Apple says you need iOS 16 or iPadOS 16.1 or later to see saved Wi-Fi passwords.
Key point 4 of 5
Based on Apple's support pages, on macOS Sequoia (15) and later you use the Passwords app.
Key point 5 of 5
If no device of yours has joined the network, you'll need the router or its owner.
Quick tip
Microsoft's documentation says the plain-text key is shown only when you have administrator rights, so use an admin Terminal if Key Content is…
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How do I find my Wi-Fi password on my phone?
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Being Tricky