MS Flow Support has released an update and this issue seems to have been resolved.
Please check if there is still an issue with the related Flow. If so, please let us know.
The issues of last week were well followed by MS admins in this thread:
The Flow issue appeared to be:
The SharePoint connector issue in Flow that was throwing throttling errors has been resolved.
This issue seems to have recurred. We have over a dozen previously working flows that are randomly showing connection unauthorized errors. I've tested multiple levels of permissions for SharePoint list and site collection access, multiple accounts, new connections, and recreating a flow from scratch. Nothing helps. All of the errors are on the trigger action. Some flows referencing the same connection, the same site collection, and the same list, trigger and work correctly. All of the flows are shared with the same owners and reference the same group of sites collections and lists. Trigger actions are added, updated, and deleted.
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