I use the File System connector to write a file back on premise via the gateway. A number of flows in the one account use this method. They are all working fine.
I went to create a new flow that did something similar - but the connection for the File System connector was to use a different path. When trying to configure this new path a license error now occurs.
"Your license(s) doesn't support use of gateways."
If I revert this connector to using one of the previously configured connections, it works.
So the hypothesis is that with the recent Flow plan license changes there was some date that anything created prior works but anything after that date doesn't work.
I've tried removing the license and readding it.
The admin portal says "Microsoft Flow Plan 1 (qualified offer)"
I've seen others with these same symptoms in other threads.
I can confirm that the legacy Flow Plan 2 licenses don't seem to be affected by this. I created a new flow using an existing connection without issue or warning.
I think the other comment about purchasing the new flow license would likely solve. Please mark it as answered if it did.
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