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Unlocked LG G6 has "Invalid SIM" error with non Sprint SIM.

Journeyman kbs
Journeyman

Unlocked LG G6 has "Invalid SIM" error with non Sprint SIM.

I have a LG G6. It was international and domestic unlocked by Sprint. The phone worked well with a AT&T SIM for couple of days. But after a software update, my phone says "invalid sim". UICC unlock gives "AUTHENTICATION ERROR". Factory reset doesn't work. I contacted Sprint 3 times via chat and phone. Every time I was told my phone is unlocked and there is nothing Sprint can do. Now I am stuck and frustrated. Please help.

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