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Access Points with mismatching Passwords

I’m a Tech Coordinator at a local school and in the process of learning about the network at and help solve their problems.

I discovered that the upstairs access points have a different password than downstairs.

What effect does mismatched passwords have?

Can this influence Wi-Fi coverage?

All access points function and are working properly according to analytics but only one upstairs seems actually handling networking/devices.

Does anyone have any thoughts?