Hi James Croxford,
First, my pleasure to assist you.
As per your description, please don’t worry, we can work together to narrow down and resolve the situation.
It seems you create a connection between Google sheets to Excel 365 with Power Query and when you use select Get Data> From Other Sources > From Web feature and Excel will Download the Google Sheet into Excel instead of loading it into Power Query from your side.
If my understanding is right, for the situation you encountered, we do understand the inconvenience caused and apologize for it. Based on my test result, when I use the Web connector (URL + "/export", or "export?format=xlsx" and it will not download Excle file but i cannot see loading table in Excel Power Query.
Here are my steps you may try and check if there is any difference:
1.Open your google sheet and click on share button and select Anyone link.
2.Select Copy link button.
3.Open Excel 365 blank workbook and click on Data tab> Get Data> From Other Sources > From Web and past the link here
4.Follow the prompt instruction. And It will load into Power Query but without getting data table.
In the meantime, please provide us the version information. To check version: Open Excel>File>Account>Product Information and capture a full screenshot and share here (Please mask your private message) and we will be tested on that version and verify the result with you.
Your understanding and patience will be highly appreciated. I hope that you are keeping safe and well!
Best regards
Waqas Muhammad