Translation:I need to work overtime every day this week.
"I've to" is very unnatural for most English speakers. It might be used by some older British people or in some regions of the UK. But most of us would say "I have to".
This is a longstanding Duolingo glitch. In order to be able to recognize the contraction when "have" is an auxiliary verb in a present perfect construction, it also allows it both when "have" is the main verb and when it's used as a modal.
"I've to call me Mum." Eastenders for certain. Loved that program.