The second loop basically just creates the same content that’s already in line so it wants you to print that again instead.

I wonder what it would say to

name = "World"
print(f"+{'':-^{len(name)}}+\n|{name}|\n+{'':-^{len(name)}}+")

Drop the second loop entirely and just do print(line + '+') again at the end - line and lin2 contain the exact same string so it's unnecessary to construct it twice.

consider

line += "-" * len(name)

Finish putting the + in the line and print it out again:

name = 'World'
line = '+'
for _ in name:
    line += '-'
line += '+'
print(line)
print('|' + name + '|')
print(line)

Strings also can be repeated with a * operator:

name = 'World'
line = '+' + '-'*len(name) + '+'
print(line)
print('|' + name + '|')
print(line)