Is there any chance you have a USB OTG (on the go) adaptor attached to your Tab E? If so, there is a known issue with Square App not working on Tab E devices with that adaptor. I know that might be an obscure question, but thought I should ask it. Here is a picture of such an adaptor, as well as a link to known device issues with Square,
https://squareup.com/help/us/en/article/5510-square-and-devices-with-known-issues
Chip A.
Square Expert & Innovator and member of the Square Champions group. (But NOT a Square employee, just a seller like you)
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