my IG account just disappeared??

I loaded a new account into jarvee about a week ago and did the PV, email V, etc. It shows up as valid still. I have been warming it up by just logging in through embedded browser and following a few people, liking, commenting, etc. Well I tried to log in last night and I was asked to enter login credentials. IG says there is no user by that name. I have logged in before that way and have had no trouble. I never started jarvee on it, and now it appears to have vanished into thin air. What on earth could have happened??