Hi Alex,
Welcome to our Community Forum. We are glad to offer help for you.
According to your error message screenshot and description, we tested on our side. If you follow the steps below, you may not meet the same issue:
- Delete the targeted template in its root location
- Go to Excel Home> More templates> New
- Right-click the targeted template> Remove from list
- Restart your Excel
Hope the above information can give you some guidance, please feel free to let us know if there is any progress, I’ll continue to help you.
Best Regards,
Sandro