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Hi Paul,
Thank you for your message in this forum.
According to your description, it seems that you cannot use XLOOKUP feature in Excel client.
If so, we have tested it on our side and we cannot reproduce the same situation as yours. Given this situation, we’d give you some suggestions below and hope that will help you.
1. You mentioned “I have checked for Office Updates through File -> Account -> Office Updates to no avail”, does it mean that you have updated your Excel but it didn’t work? If so, please refer to this article: Update history for Office 365 ProPlus (listed by date) to check if you have the latest version of Excel, if not, you can update your Excel to the latest version to check if the same problem will occur.
2. Hold Ctrl key to launch Excel in safe mode, this can narrow down whether there’s any third-party add-ins affecting that. If the issue disappears in the safe mode, you may need to manually disable all add-ins then add them 1 by 1 to narrow down which is the one affecting that.
3. If the suggestions above don’t work, you can refer to this article: Repair an Office application to repair your Office.
If the problem still persists after trying suggestions above, could you provide the information below?
1. Could you provide the Product Information and Version of your Excel? You can go to Excel > File > Account and provide the full screenshot of Product Information.
2. May I know if all files have the same problem? You can create a new file to check if the same problem will occur.
3. May I know if you encountered any error message? If so, could you provide the screenshot of it?
Best Regards,
Sukie