Password prompt misses to register some characters in MacOS Sequoia 15.2

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Op wrote " Worth noting is that we have zero issues with our keyboards outside of the password prompts! Also, my colleague typically enters his password using the built-in keyboard of his M2 MacBook Air and I do it using a Magic Keyboard (the one before Touch ID) wirelessly connected to my M4 Pro MacBook Pro while in clamshell mode. "

To Test your computer - do you experience this issue when using your Builtin Keyboard ?

Sorry, comparing one user's experience , who is using the builtin keyboard, to you using a Bluetooth Keyboard is akin to comparing apples to oranges

FYI - Using 2 Non Touch Apple Magic Keyboards, one on a M2 Mac Mini and a second M4 Mac Mini and the need to Double Register a singular key to register does not happen here on Sequoia 15.2

Using a M3 MBA, also on Sequoia 15.2 with the Builtin Keyboard - no need to double register 1 or more keys to Register

markuss-work wrote:

Ah, excellent comment! On my own computer I experience this issue both when using the built-in keyboard and when using my external Magic Keyboard with the computer in clamshell mode. The Magic Keyboard can be wirelessly connected or connected using a lightning cable, the issue still persists.

Restart in Safe Mode.

This will perform a Disk Repair, clear cache files and only load Apple Software, extensions and fonts.

The boot up will be slow and can take some time - Normal.

Safe Mode will also eliminate Third Party Software, extensions and drivers from loading.

It will only load the Minimum amount of Core Apple Processes to allow the the computer to function at a reduced Level of Performance 

Does the issue present in this mode ?

Sometimes a Safe Boot followed by a Normal Boot will just put things right.

You stated it only happens 50% of the time. If you are a touch typist, try slowing down the rate that you type in the password.

To me, this could be indicative of a possible hardware issue with the builtin keyboard

How I arrive at this is simple

Until the entire operating system is fully loaded

That would have only occur, after, you have successfully logged into the computer

So, conclusion would be, Not the Operating System in and of itself, but points elsewhere

Well, I'm afraid the problem is very peculiar. The fact that it happens with both the internal and an external keyboard, and is always the same key, and, is only in a password text field, defies logic. Is the key a normal alphabetic or numeric key?

Just a suggestion, change your password to something without the problematic key.

To further trouble shoot this odd keyboard issue

Use a cheap inexpensive Third Party USB Keyboard

That is why I always keep a cheap usb keyboard at the ready and just incase

Test in either Safe Mode or Normal Mode if the Double Tap of a single key is required

It's just a very obscure problem. I have several Macs here, three of them running Sequoia 15.2 and none with the problem you describe. And yours is the first post I've seen describing it.

Is it mathematically possible for a singular key on a built-in keyboard, wired or Bluetooth-connected Apple Keyboard, and various third-party USB keyboards to malfunction simultaneously?

This scenario is so minuscule that it almost defies mathematical calculation. 

Nay - the real issue is somewhere else