If you came across this post because you are trying to use the SharePoint connector with Logic Apps in GCC High…let’s continue below…
https://learn.microsoft.com/en-us/connectors/connector-reference/connector-reference-logicapps-connectors shows that SharePoint is supported in Azure gov, but that turned out to not be true.
After spending too much time trying to figure out how to make the SharePoint Connector log into GCC High, I popped a support ticket. Microsoft quickly told me that it indeed does not work in GCC High, but should be available this year (2023). I had to laugh because the support rep said it would be quicker to implement the fix into GCC High than update the documentation. LOL, I’ve been working with Azure for so long that statement is 100% true.
Workaround? Power Automate. That stinks because it requires a license, but it is what it is.