cant help here I dont pay newegg with btc.
This happen to me just last week when I tried to pay my January hosting bill at GND.
After talking to GND.... the solution was to install Bitpay app on your mobile (I use a Samsung Note 8 ).
I never did have to do that - looks like Bitpay changed their internal process and forcing everyone to use their app.
Fund your Bitpay wallet (treat it like a mobile wallet) and use their builtin QR scanner to pay.
Good luck.
or use mycelium (mine is on android). worked for me at newegg. scan qt code and go.