Simplest solution may be to remove the account from the device. On my android phone it is Settings\Passwords & accounts
--please don't forget to upvote
and Accept as answer
if the reply is helpful--
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I have deleted an account in Microsoft Authenticator as I have moved the account over to a work device.
The problem is that I am now receiving push notifications on my work phone AND my personal phone where I deleted the account.
Why am I still receiving push notifications on the device where I deleted the account?
Simplest solution may be to remove the account from the device. On my android phone it is Settings\Passwords & accounts
--please don't forget to upvote
and Accept as answer
if the reply is helpful--
I just experienced this first hand and the solution was:
That worked it for me.