If the affected account is a family account (but not the MasterUser) you can access the Inbox indirectly by logging in to the MasterUser, selecting Settings->Users, and clicking Open Inbox against the account that has the issue. From there, you can navigate anywhere within the account as normal.
If it is an independent individual account, and you do not have an external mail client set up with an App password, I am not aware of any immediate solution.
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