After you file

I was hoping someone would be able to help me. I have filed taxes current to 2018. I did have to file my federal taxes by mail in 2018 and i received my federal refund my actual check for 2018. when i enter the info the get my payment tool is requesting, the site says the info does not match. I am entering it just as it is on my return. It does say i am eligible for the stimulus payment and that they just need to verify the info, however for whatever reason the return is not matching. Does anyone have any idea of how I can ensure I get my payment?