I installed an update for the most recent version for MCPE, and when I did, and still does, says there is an error with my account saying I will be unable to use the marketplace; It displays an error list say 'Error Number -9"
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Thank you for your report!
We're tracking this issue in MCPE-117294, so this ticket is being resolved and linked as a duplicate.
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Try this: Log out > close minecraft > open minecraft > log in with your account.
I got the same issue and that work for me