Unable to attach a block volume to an Always Free tier instance

Summary

Button to attach block volume is disabled on instance creation and instance block volume edit after creation.

Content

This has been happening since a while ago, but for some reason the button to attach a block volume in the instance creation screen is disabled, and nothing that I change on the screen re-enables it. I didn't reach the Free Tier limit, no messages are provided, only a disabled button. I would really appreciate if anyone could help me on this one 'cause I can't find anything on the web related to this.