if you see this error when opening a lab/assignment:
“We were unable to retrieve a launch URL. Please make sure you are logged in to Coursera, and have access to this lab.”
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make sure you have a valid subscription
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try if you can open it from (a) incognito mode of your browser / (b) another browser / (c) another device. If you can, you may clear the cache of the browser in question and try again.
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if none of the above works, you need to contact Coursera which manages your access and your account. Click this link to start.
Quoted from coursera:
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