as long as the POA acts within their authority.
This is the key statement. For example, most states do not permit the POA to "gift" funds unless the POA document specifically grants this authority, meaning that they are not permitted to change ownership of an account or designate beneficiaries on behalf of the principal.
If an account owner wants to close an account and open an new one on their name only or request a cashier's check be payable to just them due to divorce, conflict, etc. we can do that. If a POA makes the same request on a joint account, we likely need to make the cashier's check payable both owners or open a new joint account. Get it wrong and the bank could find itself on the receiving end of a lawsuit. So I agree it is not wrong to have two different POAs representing each owner, but some institutions may choose not to accept the legal and financial risks of managing the account in this fashion.
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