instagram asks for my phone number then a confirmation code, and error happens when I put the code

This error is usually caused by network latency, expired OTP code, or a clogged browser cache. Try switching to a 4G/5G mobile data network, using incognito mode, or clearing your cache before re-entering the code. If the new code still fails, wait 15 to 30 minutes for the system to reset the security time limit.

wait 24-48 hours, try a different device or network, and contact Instagram Support if it still won't let you in.