This is what coursera’s help says
You’ll only be able to access your Coursera Lab assignments and Jupyter Notebooks if you have a paid Coursera membership. If your subscription ends, you’ll be put into audit mode and won’t be able to access them
If you think you have an active subscription but you are not able to assess the lab, I suggest you to contact coursera ASAP. This is the link to the coursera’s help center and also the instructions of “how to contact cousera”. You can find a link to their contact form in the bottom.
Raymond