LG G4 H811 T-mobile weird problem

So i had to repair an IMEI on the H811, I used an IMEI from a fully paid device so there is no block. I know we can only unlock through the device unlock app, since there is no block on the phone, i keep getting the same error from the app. Device not recognized by your service provider. Please call customer care.
So i tried another IMEI which is also fully paid and keep getting the same error. Anyone successfully unlock the phone after IMEI repair with the t-mobile app? I’ve seen phones around that had IMEI’s repaired then unlocked, ***** people don’t want to help others and explain how they unlocked it.