I have workflows scheduled to run overnight at 1 AM and again at 1 PM. Both of which are not firing, could you please let me know why this could be the case?
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Perhaps it is being interfered by a Microsoft administrative tasks.
For example Microsoft will make a backup every 12 hours on your tenant.
If you can, try to browse your site at that time, and see if it is online.
Another test you can make is to delay a workflow to 1AM and then loop every 5 minutes and loging workflow history messages, to realize what 's happening on that time.