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Hi Craig,
Welcome to Microsoft Community.
No, the STOCKHISTORY function does not have the symbols to query bond yields. Bond prices are not transparent, priced infrequently, and sometimes updated with minor data only after long periods. Moreover, most transactions occur over the counter, making it difficult to obtain yield information. The stock data provider LSEG Data & Analytics, which collaborates with Microsoft, has no immediate plans to use new technologies to predict bond prices either.
You may consider some third-party Excel add-ins to query bond yields, such as Cbonds from the Excel Add-in Store:
Hope the information I've shared above will help you find a better direction. If you have any other questions or want to share more context, please let me know in your reply!
Best Regards,
Thomas C - MSFT | Microsoft Community Support Specialist