My signature is not being hyperlinked despite copying the code, is this ok?
Also, what does this mean? Post must have at least 100 signs to be accepted.
Yes, it's fine. Unfortunately, this is the display for users with junior rank.
100 characters means that you have to write a post that has 100 characters - your entire post must have a minimum of 100 characters to comply with the rules.
https://www.charactercountonline.com/