Chip & Swipe reader not working. Credit payment greyed out

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My chip and swipe reader is connected properly and the app is up to date. When I click charge it goes to the select payment screen. The option to select credit is greyed out and unclickable. Customers cannot use their card to pay me. Does anyone have a fix for this? The reader is brand new. I am using an Android phone. Everything is connected correctly. I have already called support. They could not figure it out and had me send a report. They told to wait for an email. I also reset the reader and still have the same problem