As of yesterday Dec 7th, users are unable to execute pagination reports in the Power BI service and receive an error saying parameter values have not been specified for optional (allow blank) paramet...
Thanks bizwiz , We ended up reverting back to the September Gateway. It fixed our other issues with reports not being able to render, but we still have the same optional parameter issue so yeah it's a recent issue we're facing as well. Unfortunelty we've been having multiple issues with Paginated Reports and seems to keep happening. Not the best experience.