Does anyone know if Netsuite logs (that is accessible to users) what HMAC-SHA-method is used in TBA calls? I would rather see which integration uses which method and then ask them to update than to randomly ask all external applications to update.

I was thinking the same, after getting the email from them yesterday regarding 2021.2. I was going to open a ticket

Yeah, I got the same email from a bunch of environments. I noticed that all my postman's were setup with SHA1. So I hope that some of it was my testing that was logged.