I am trying to use interwine tool but it isn't working. please help

Hello ​@andreaf23600721 

Thanks for reaching out. I hope Monika’s suggestions helped resolve your question. If not, kindly share a sample file along with a brief screen recording of your exact workflow so we can better assist you.
 

Looking forward to hearing from you.
Anubhav

You first need to move the ring, so that the blue thing can go through it at all.. Then select both elements and Object > Intertwine > MAke. Then roll over with the cursor and click.

Both objects are vector paths, right?