
Hi @Li, Ruoxin,
Thanks for posting your question in the Microsoft Q&A forum.
To better assist you with the issue that the SharePoint list validation does not show error message if using "edit in grid view", I’d like to ask a few quick questions to better understand your situation:
Have you tried creating a new list using the same validation formula to see if the issue still occurs?
Could you please share the formula you're using and the columns involved (feel free to redact any private information)? This will help me try to reproduce the issue on my end.
If possible, could you provide a screenshot of the issue and specify the column types you're working with?
I’ve tested this formula on my end, and the validation error does appear in "Edit in grid view." To help troubleshoot further, I’ll need more details from your setup so I can try to replicate the issue accurately.
Once again I'm sincerely sorry for the inconvenience that you've encountered. But I need to know more about your situation so I can help you better. I appreciate your patience and are here to help. Looking forward to your response
If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.