Hi @ausddhjkljkjkl - I'm sorry to hear that this issue with your card reader has brought you to the Seller Community.
I double-checked our compatibility page and confirmed that your Samsung Galaxy S20+ is compatible with the Contactless + Chip reader. I suggest running through the troubleshooting steps for your reader listed here. If this doesn't improve things, please reach out to Support directly by logging into your Square account and heading here for further assistance.
I hope this helps!
Violet
Community Moderator, Square
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