When an email is received in one's bank name and asks for account number, it is more likely a fraud and should be reported immediately.
It is very uncommon and rare for bank to contact an account-owner and when they does, it is usually for complicated situations, complimentary messages, product offers etc
This type of message received (in question) are usually from a malicious party disguising as you bank and it is referred to as email phishing.
In conclusion, when an email is received in one's bank name and asks for account number, the intent is more likely a fraud and should be reported immediately to necessary department.
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