Hello,
For the last three days we have been experiencing on and off issues with "Get items" action inside multiple (in order of tenths) flows.
The pattern is that the same flow (that runs every 5, 10 or 15 minutes) will fail for a few runs, then will work again normally for some time, then fail again, etc. — no changes made to the flows obviously.
Here's a typical picture:

When inspecting failed flows, here's the error it gives:
"{"error_description":"ID3035: The request was not valid or is malformed."}"
Inspecting raw outputs gives some additional details:
"x-ms-diagnostics": "3001000;reason=\"There has been an error authenticating the request.\";category=\"invalid_client\"",
Trying to change and save any of the flows when it's out gives the following message (yeah, repeats same three times):
"Flow save failed with code 'MultipleErrorsOccurred' and message 'The dynamic operation request to API 'sharepointonline' operation 'GetTable' failed with status code 'Unauthorized'. This may indicate invalid input parameters. Error response: { "error_description": "ID3035: The request was not valid or is malformed." };The dynamic operation request to API 'sharepointonline' operation 'GetTable' failed with status code 'Unauthorized'. This may indicate invalid input parameters. Error response: { "error_description": "ID3035: The request was not valid or is malformed." };The dynamic operation request to API 'sharepointonline' operation 'GetTable' failed with status code 'Unauthorized'. This may indicate invalid input parameters. Error response: { "error_description": "ID3035: The request was not valid or is malformed." }'."
I feel like we hit some limits and the system is throttling, but it would be great if instead of telling 'Unauthorized' it would specify which limits you've hit. But maybe there could be other reasons?
Any help is appreciated. Thanks!