Tool: MetaboAnalyst 6.0 web platform
Module: Batch Effect Correction (single merged file upload)
Issue: All batch correction methods return “Your data is not eligible for this method!” for every method including Automatic, ComBat, EigenMS, etc.

This appears to be the same issue reported here: https://omicsforum.ca/t/batch-correction-issues-even-examples-not-eligible/13751
I spent time troubleshooting the formatting of my data file and have ruled out the following as potential causes:
- No spaces in feature names or sample IDs
- Feature names coded as numbers to avoid any naming conflicts
- No missing values
- No duplicate feature names
- Tried both “Sample in rows” and “Sample in columns” upload formats
- Sample IDs are alphanumeric
- Metadata rows in correct order: Class → Batch → Order
Despite all of the above, the error persists across all batch correction methods (automatic, EigenMS, ComBat, etc.). Most importantly, a data file that successfully underwent batch correction in this module last week is now returning the same “not eligible” error with no changes to the file. Is it possible that the batch correction module is currently experiencing a server-wide issue, rather than formatting problems causing the error? If so, when is the estimated timeline for resolving this issue?
Thank you so much for the help and guidance!
