Both of you can send and receive direct messages again. However, any messages they sent while they were blocked will never be delivered to you.
How to Block and Unblock Someone on Instagram - Security.org if you unblock someone on instagram what happens
Unblocking someone on Instagram essentially resets the "digital wall" between you , but it doesn't automatically restore your previous connection. Both of you can send and receive direct messages again
The consequences of unblocking differ slightly depending on your account type: if you unblock someone on instagram what happens
However, they might figure it out on their own if: