Hey there Harris thanks for reaching out and for bringing this up, we briefly had an issue opening up Workbooks in Clay earlier, which has since been addressed. Checking your workbook link you shared, it is now accessible to open, if you continue to experience any other issues, you can reach out to the team so that we can address it.
Aamir you should also be able to open you workbooks now as well, if you can just check and confirm for us.