Store ID vs. Influencer ID
EverySqueeze needs your Amazon Store ID, not your Influencer ID — they're different Amazon programs.
These are not the same thing, and mixing them up is the most common Amazon setup mistake.
Store ID (what EverySqueeze needs)
Your Store ID is the tracking ID EverySqueeze uses for every link it builds. It sits in the top-right corner of affiliate-program.amazon.com when you're signed in, and looks like yourname-20. Enter it in Amazon tracking IDs.
Influencer ID (a different program)
Your Influencer ID starts with ONAMZ and belongs to Amazon's Live/Storefront side, not the off-site affiliate links EverySqueeze builds. EverySqueeze won't ever suggest an onamz-prefixed id for you automatically, but it doesn't block you from typing one in — a link built with it would never earn a commission on the platforms EverySqueeze posts to.
If you're not sure which you have
Check affiliate-program.amazon.com directly rather than guessing from a saved value elsewhere — an ID that starts with letters other than "onamz" and ends in a short suffix like -20 is almost always the Store ID EverySqueeze wants.