I have same problem. I need to change my primary email address but when I try to do that paypal wants my "full bank account number" and then after I enter it it says: Sorry — your last action could not be completed i tried my 10 digid account number, full 24 character IBAN number and several other combinations but I am still unable to change primary email I know the account number that paypal is asking for (it shows me last 2 digits and I have just one bank account) but paypal seems to have some problems here...
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