I had this happen too. I've been on Instagram for years but very very inactive (only posted 3 photos) now that I've started sweeping again I've started using my account. Once I started following things for extra entries I started getting an action blocked notice. Now I can't like or comment on anything either. I've submitted through report a problem multiple times but haven't heard back. I'd love to know how to fix this problem too.
After weeks of no response, Instagram suddenly unblocked me without notification of same.