Onpass does come up in two (questionable) dictionaries as a valid word.

But, its usage is very rare. NGRAM shows it to be nearly nil.

I don't think there is any reason to use one vs. the other. The meanings are identical.

If a particular office is using it, it likely is a local (to that office) cultural expression.

Onpass does come up in two (questionable) dictionaries as a valid word.

But, its usage is very rare. NGRAM shows it to be nearly nil.

I don't think there is any reason to use onpass vs pass on. The meanings are identical, but pass on is likely considered preferable.

If a particular office is using it, it likely is a local (to that office) cultural expression.

Onpass does come up in dictionaries as a valid word.

But, its usage is very rare. NGRAM shows it to be nearly nil.

I don't think there is any reason to use one vs. the other. The meanings are identical.

If a particular office is using it, it likely is a local (to that office) cultural expression.

Onpass does come up in two (questionable) dictionaries as a valid word.

But, its usage is very rare. NGRAM shows it to be nearly nil.

I don't think there is any reason to use one vs. the other. The meanings are identical.

If a particular office is using it, it likely is a local (to that office) cultural expression.