Some students caught in authentication loop

Is there something going on today with Sketchup for Schools? First, some of my students, not all, could not access files in Sketchup for Web despite clearing caches, restarting, etc. They then tried to set up Sketchup for Schools but are repeatedly asked to sign in via either Google or Microsoft. We use Google, so they keep clicking that link, selecting their Google ID, click and are taken back to the page to select Google or Microsoft. Any ideas?