Both may work as I found reliable sources mentioning as and on with the noun priority. Please take it as priority - the work itself is priority and I'm least bothered what tasks you may take after my (this) instruction.
How do you use priority in a sentence?
Priority sentence example
- The first priority was rescuing children. ...
- The priority should probably be assigned to the Orosius, but the point has been much debated. ...
- Somehow it simply wasn't top priority in her life right now. ...
- I'll make it a priority from now on.
Which preposition is used with priority?
In 11% of cases priority on is used
Every day you have a choice of doing things as they come along or focusing on priorities. This Federal Register notice provides the last opportunity for public comment on priorities for research in 1996.