Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
Dear Charlie,
After you import the Excel sheet, it should become a list and will be showed in the SharePoint mobile app. The view in the list is generally the mobile view in the SharePoint mobile app. When you open the list, there should be a Search box and you can search the list items.
You can also use the Microsoft Lists mobile app to search the list as well.
Announcing Microsoft Lists - Your smart information tracking app in Microsoft 365
What issue do you encounter in your environment? If yes, some related screenshots are appreciated.
Note: Remove any private information before uploading the screenshots.
Thank you for your time and effort.
Sincerely
Cliff | Microsoft Community Moderator