BCNR is the Board of Corrections for Naval Records. They are the administrative agency tasked with correcting errors in Naval records. In your case, they are the folks who have the power to order you be retired.
There are one of two possibilities present.
1. The DD214 that you received for your "dual status" time that indicated the number of active duty days is accurate (that is, the days listed for active duty are, in fact, for days of active service.
I keep using that term. "active service" since that is what the law requires. In order to qualify for retirement you must meet the Title 10 US Code requirements. If you do? Then you rate retirement. Period.
2. That the DD214 you received for this time is in error (that you are not entitled to active status for this time.
I did some research into the MILPSRSMAN and the SECNAVISNT that applies and could not find anything that states clearly that this status you were in (the dual status) triggered active service credit. But at the same time I did not see it addressed to say that it did not count.
I would file a request with the BCNR to have your record changed to reflect you in retired status (based on your active duty time). That is the next step to press this. You file DD Form 149 to start this process
I did find something interesting.
If you look at title 38 US Code, section 1965, you see this
For the purpose of this subchapter—
(1) The term “active duty” means—
(A) full-time duty in the Armed Forces, other than active duty for training;
(B) full-time duty (other than for training purposes) as a commissioned officer of the Regular or Reserve Corps of the Public Health Service;
(C) full-time duty as a commissioned officer of the National Oceanic and Atmospheric Administration; and
(D) full-time duty as a cadet or midshipman at the United States Military Academy, United States Naval Academy, United States Air Force
Academy, or the United States Coast Guard
So for Title 38 You were active duty. That said Title 38 is for VA benefits
, and not title 10 service necessarily.
I would file the 149 form...and consider working with an attorney to help you complete it. What you describe, unless that DD214 is in error, you should qualify for retirement