We have had a few teachers have this pop up today as they were trying to add a Unified Classrom Assignment Block in ClassPages:
Two weeks ago during training the Unified Classroom Class Pages (PS Learning) were really slow or totally offline. My attendance clerk is complaining that the SIS is very slow today as well. It could be just a bad day for hosting. I was able to post a UC Assignment content block on my class page a few minutes ago without any issues.