Update error scenarios when accessing Microsoft Graph using device code flow

[jiasli]

Error may also occur when directly loging in with Microsoft Graph as the scope by running az login --use-device-code --scope https://graph.microsoft.com//.default.

[learn-build-service-prod]

Learn Build status updates of commit ac53d9e:

✅ Validation status: passed

File	Status	Preview URL	Details
docs-ref-conceptual/microsoft-graph-migration.md	✅Succeeded	View

For more details, please refer to the build report.

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[learn-build-service-prod]

Learn Build status updates of commit ac53d9e:

❌ Validation status: errors

Please follow instructions here which may help to resolve issue.

File	Status	Preview URL	Details
	❌Error		Details

• [Error: CannotMergeCommit] Cannot merge commit ac53d9ec02734ef06ae4094bd3b9003042b5d45b in branch device-code of repository https://github.com/jiasli/azure-docs-cli into branch main (commit 8a10fa986cc9a9c75e09d93cd27545ba93ab97b9). Please follow this documentation: https://help.github.com/articles/resolving-a-merge-conflict-using-the-command-line/ to use git.exe to resolve you content conflicts locally and then push to remote.

For more details, please refer to the build report.

Note: Your PR may contain errors or warnings or suggestions unrelated to the files you changed. This happens when external dependencies like GitHub alias, Microsoft alias, cross repo links are updated. Please use these instructions to resolve them.

For any questions, please:

• Try searching the learn.microsoft.com contributor guides
• Post your question in the Learn support channel