[Solved] Prevent icon from appearing in my Mac’s Dock when I text on my iPhone [duplicate]

dmt Asks: Prevent icon from appearing in my Mac’s Dock when I text on my iPhone [duplicate]
I don’t want iMessage on my MacBook anymore, at all. I’ve signed out of all accounts on my MacBook but when I start a text on my phone, this creepy icon appears, so it still knows I’m texting.
dock

I’ve read various related questions here, here, here and here but they’re not quite getting at the same thing.

Does anyone know how to prevent this? I’m running Big Sur and hadn’t noticed this previously, but I tend to leave a while before updates (precisely because there’s always something annoying like this).

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