Sentence examples for both reasons are valid from inspiring English sources

Both reasons are valid.

All those reasons are valid, because they are gainful in some way.

They all have different reasons for leaving, but these reasons are valid.

All of those reasons are valid, but you are more likely to stick with things with an internal motivation.

Only certain, serious reasons are valid for terminating someone's parental rights without permission.

This study could not be used to determine which of these possible reasons is valid for these students.

If you don't think your boss's reasons were valid, consider switching to a different group or department (if you can do so without instigating awkwardness) or to a different company entirely.

Both reasons are perfectly valid.

Validity Are you sure this reason is valid?

I challenged him about whether his reason was valid.

Any reason is valid.