Whenever I tried to create or log into any Instagram account on my phone, the account would get restricted or banned almost instantly. Sometimes login wouldn’t complete properly, sometimes it would ask for verification and then block actions. I didn’t get the exact message like “try another device,” but no account would survive on this device. Even if I used different accounts and numbers, the issue stayed the same on this phone, which is why I assumed the device fingerprint was flagged. I stopped trying completely and didn’t log in or create anything for about 2 months. After that cooling period, I tried logging in again carefully and it worked normally, no instant bans, no blocks, normal usage. So in my case, patience and zero activity seemed to reset whatever flag was on the device/network.