Buyer cannot see pay now button

Hi, I sold an item and sent a invoice. I received a message from the buyer saying
eBay told him he got outbidded, but it shows he won, which he did, 1 bid only.
He then informed me he cannot see the pay now button, he said he is willing to pay.
I sent 2 invoices, still nothing. He asked could he pay by paypal direct.
Just needed my email. I tried to send it but message was blocked
By eBay for the use of an email address. Anyone know what I can do??
Thankyou for any help.