Thank you for your suggestions! After trying again and again today and talking to support twice and chatting again twice, I was about to give up. I was told that the message meant lack of availability and to try a PRICELINE EXPRESS offer. I did and still received the same message. So using the PRICELINE link, I bid $72 on a 3* Cape Cod - Eastham hotel. I did not log into my priceline account and entered all the credit card info. My bid went through and was rejected. Priceline countered for me to up my offer by $14 to $86. I increased my offer to $76 and it was accepted. Thank you for suggesting that I not log into my account. I guess something in my account info triggered an error message that no one in support was familiar with. I spent way more time on this than it was worth, but I was frustrated and wanted to figure it out. Thanks again.