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Hi Tom,
Appreciate your sharing with the file.
I have checked that and did some tests on my side, kindly check the screenshots below. With just three items, we can easily find that in other types of charts, they are all good to show all data which indicates that the data is good to be selected into the data resource.
As the same behavior happens on several test PCs with various versions, the issue may be related with the connection between Maps feature and Bing. I double confirmed this because there has a yellow warning bar on my test workbook(you may not get this with the large data and the percentage is nearly 100%(just my guess)).
When there have 3 items, it said plotted 67% of the locations, while there have 7 items, the percentage is changed to 86%(should be 85.71% exactly). Hence, it seems like it is not only a bug but also a known issue from the Bing side.
In this situation, I may sorry to convey that it is a feature limitation in Excel for now and the only way I could suggest you is to send the feedback in Excel so that the related product team could further investigate it and connect with the Bing side to have a update on this specific county maybe.
Appreciate your understanding and effort on this thread, hope above test results could offer a little bit help for you.
Have a nice day and feel free to post in our forum if you need any other support someday.
Best Regards,
Mia